/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono1_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 18:36:01,993 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 18:36:02,001 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 18:36:02,039 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 18:36:02,077 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 18:36:02,084 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 18:36:02,085 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 18:36:02,086 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 18:36:02,086 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 18:36:02,086 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 18:36:02,086 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 18:36:02,086 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 18:36:02,086 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 18:36:02,086 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 18:36:02,087 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 18:36:02,087 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 18:36:02,087 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 18:36:02,087 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 18:36:02,087 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 18:36:02,087 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 18:36:02,088 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:36:02,088 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 18:36:02,088 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 18:36:02,088 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 18:36:02,088 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 18:36:02,088 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 18:36:02,088 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 18:36:02,088 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 18:36:02,271 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 18:36:02,287 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 18:36:02,288 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 18:36:02,289 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 18:36:02,290 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 18:36:02,291 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono1_1-1.c [2022-03-20 18:36:02,356 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d37c4457f/9caedfd9905845489739b18914a6fb97/FLAGccc65ba2d [2022-03-20 18:36:02,712 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 18:36:02,712 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-1.c [2022-03-20 18:36:02,716 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d37c4457f/9caedfd9905845489739b18914a6fb97/FLAGccc65ba2d [2022-03-20 18:36:02,724 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d37c4457f/9caedfd9905845489739b18914a6fb97 [2022-03-20 18:36:02,725 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 18:36:02,726 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 18:36:02,727 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 18:36:02,727 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 18:36:02,729 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 18:36:02,730 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:36:02" (1/1) ... [2022-03-20 18:36:02,730 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58b7ce85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:36:02, skipping insertion in model container [2022-03-20 18:36:02,730 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:36:02" (1/1) ... [2022-03-20 18:36:02,734 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 18:36:02,741 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 18:36:02,881 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-1.c[313,326] [2022-03-20 18:36:02,924 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:36:02,932 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 18:36:02,941 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-1.c[313,326] [2022-03-20 18:36:02,943 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:36:02,950 INFO L208 MainTranslator]: Completed translation [2022-03-20 18:36:02,951 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:36:02 WrapperNode [2022-03-20 18:36:02,951 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 18:36:02,952 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 18:36:02,952 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 18:36:02,952 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 18:36:02,959 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:36:02" (1/1) ... [2022-03-20 18:36:02,959 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:36:02" (1/1) ... [2022-03-20 18:36:02,964 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:36:02" (1/1) ... [2022-03-20 18:36:02,964 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:36:02" (1/1) ... [2022-03-20 18:36:02,968 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:36:02" (1/1) ... [2022-03-20 18:36:02,970 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:36:02" (1/1) ... [2022-03-20 18:36:02,974 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:36:02" (1/1) ... [2022-03-20 18:36:02,976 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 18:36:02,976 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 18:36:02,976 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 18:36:02,976 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 18:36:02,977 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:36:02" (1/1) ... [2022-03-20 18:36:02,982 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:36:02,990 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:03,000 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 18:36:03,032 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 18:36:03,055 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 18:36:03,056 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 18:36:03,056 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 18:36:03,056 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 18:36:03,056 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 18:36:03,057 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 18:36:03,057 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 18:36:03,057 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 18:36:03,057 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 18:36:03,057 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 18:36:03,057 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 18:36:03,057 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 18:36:03,057 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 18:36:03,057 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 18:36:03,058 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 18:36:03,058 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 18:36:03,059 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 18:36:03,105 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 18:36:03,106 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 18:36:03,177 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 18:36:03,181 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 18:36:03,181 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 18:36:03,182 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:36:03 BoogieIcfgContainer [2022-03-20 18:36:03,182 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 18:36:03,186 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 18:36:03,186 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 18:36:03,188 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 18:36:03,188 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 06:36:02" (1/3) ... [2022-03-20 18:36:03,188 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2caf80d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:36:03, skipping insertion in model container [2022-03-20 18:36:03,189 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:36:02" (2/3) ... [2022-03-20 18:36:03,189 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2caf80d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:36:03, skipping insertion in model container [2022-03-20 18:36:03,189 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:36:03" (3/3) ... [2022-03-20 18:36:03,191 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono1_1-1.c [2022-03-20 18:36:03,194 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 18:36:03,194 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 18:36:03,221 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 18:36:03,225 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 18:36:03,226 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 18:36:03,234 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 18:36:03,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-20 18:36:03,239 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:03,239 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:03,240 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:03,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:03,243 INFO L85 PathProgramCache]: Analyzing trace with hash 491760044, now seen corresponding path program 1 times [2022-03-20 18:36:03,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:03,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1656108618] [2022-03-20 18:36:03,256 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:36:03,256 INFO L85 PathProgramCache]: Analyzing trace with hash 491760044, now seen corresponding path program 2 times [2022-03-20 18:36:03,258 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:03,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437712648] [2022-03-20 18:36:03,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:03,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:03,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:03,344 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:03,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:03,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:03,353 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:03,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437712648] [2022-03-20 18:36:03,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437712648] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:03,353 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:03,354 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 18:36:03,355 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:03,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1656108618] [2022-03-20 18:36:03,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1656108618] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:03,356 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:03,356 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 18:36:03,356 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130404390] [2022-03-20 18:36:03,356 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:03,359 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 18:36:03,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:03,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 18:36:03,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 18:36:03,409 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:03,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:03,463 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2022-03-20 18:36:03,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 18:36:03,465 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-03-20 18:36:03,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:03,469 INFO L225 Difference]: With dead ends: 30 [2022-03-20 18:36:03,469 INFO L226 Difference]: Without dead ends: 13 [2022-03-20 18:36:03,471 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 18:36:03,474 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 11 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:03,474 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 22 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:36:03,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-03-20 18:36:03,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-03-20 18:36:03,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:03,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2022-03-20 18:36:03,516 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2022-03-20 18:36:03,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:03,516 INFO L478 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2022-03-20 18:36:03,516 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:03,516 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2022-03-20 18:36:03,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-20 18:36:03,517 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:03,517 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:03,517 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 18:36:03,517 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:03,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:03,518 INFO L85 PathProgramCache]: Analyzing trace with hash 482524834, now seen corresponding path program 1 times [2022-03-20 18:36:03,518 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:03,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [957033681] [2022-03-20 18:36:03,519 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:36:03,519 INFO L85 PathProgramCache]: Analyzing trace with hash 482524834, now seen corresponding path program 2 times [2022-03-20 18:36:03,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:03,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192797373] [2022-03-20 18:36:03,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:03,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:03,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:03,595 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:03,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:03,605 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:03,605 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:03,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192797373] [2022-03-20 18:36:03,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [192797373] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:03,606 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:03,606 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:36:03,606 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:03,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [957033681] [2022-03-20 18:36:03,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [957033681] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:03,607 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:03,607 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:36:03,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049910378] [2022-03-20 18:36:03,607 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:03,608 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 18:36:03,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:03,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 18:36:03,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 18:36:03,609 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:03,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:03,650 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2022-03-20 18:36:03,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 18:36:03,650 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-03-20 18:36:03,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:03,651 INFO L225 Difference]: With dead ends: 22 [2022-03-20 18:36:03,651 INFO L226 Difference]: Without dead ends: 15 [2022-03-20 18:36:03,651 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-20 18:36:03,652 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 10 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:03,653 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 19 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:36:03,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-03-20 18:36:03,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-03-20 18:36:03,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:03,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-03-20 18:36:03,657 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2022-03-20 18:36:03,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:03,657 INFO L478 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-03-20 18:36:03,657 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:03,657 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-03-20 18:36:03,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-20 18:36:03,658 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:03,658 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:03,658 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 18:36:03,658 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:03,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:03,659 INFO L85 PathProgramCache]: Analyzing trace with hash 925229631, now seen corresponding path program 1 times [2022-03-20 18:36:03,659 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:03,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2141794374] [2022-03-20 18:36:03,752 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:36:03,754 INFO L85 PathProgramCache]: Analyzing trace with hash -1303175503, now seen corresponding path program 1 times [2022-03-20 18:36:03,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:03,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644087930] [2022-03-20 18:36:03,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:03,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:03,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:03,882 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:03,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:03,889 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:03,889 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:03,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644087930] [2022-03-20 18:36:03,889 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1644087930] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:03,889 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:03,890 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:36:03,956 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:03,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2141794374] [2022-03-20 18:36:03,956 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2141794374] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:03,956 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:03,956 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:36:03,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565107812] [2022-03-20 18:36:03,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:03,957 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 18:36:03,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:03,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 18:36:03,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-03-20 18:36:03,958 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:04,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:04,025 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2022-03-20 18:36:04,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 18:36:04,026 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-03-20 18:36:04,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:04,026 INFO L225 Difference]: With dead ends: 22 [2022-03-20 18:36:04,026 INFO L226 Difference]: Without dead ends: 17 [2022-03-20 18:36:04,027 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:36:04,028 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 11 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:04,028 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 23 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:36:04,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-20 18:36:04,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-20 18:36:04,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:04,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-03-20 18:36:04,032 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2022-03-20 18:36:04,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:04,033 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-03-20 18:36:04,033 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:04,033 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-03-20 18:36:04,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 18:36:04,033 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:04,033 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:04,034 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 18:36:04,034 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:04,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:04,034 INFO L85 PathProgramCache]: Analyzing trace with hash 1220035546, now seen corresponding path program 1 times [2022-03-20 18:36:04,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:04,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [341790661] [2022-03-20 18:36:04,295 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:04,295 INFO L85 PathProgramCache]: Analyzing trace with hash -1244070159, now seen corresponding path program 1 times [2022-03-20 18:36:04,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:04,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851871249] [2022-03-20 18:36:04,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:04,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:04,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:04,324 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:04,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:04,380 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:04,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1220035546, now seen corresponding path program 2 times [2022-03-20 18:36:04,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:04,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024518682] [2022-03-20 18:36:04,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:04,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:04,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:04,443 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:04,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:04,449 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:04,449 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:04,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024518682] [2022-03-20 18:36:04,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1024518682] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:04,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434032373] [2022-03-20 18:36:04,449 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:36:04,449 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:04,450 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:04,460 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:04,461 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 18:36:04,494 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:36:04,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:04,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 18:36:04,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:04,529 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:04,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:04,639 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:04,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434032373] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:04,640 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:04,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 8] total 13 [2022-03-20 18:36:04,640 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:04,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [341790661] [2022-03-20 18:36:04,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [341790661] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:04,641 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:04,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:36:04,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93801069] [2022-03-20 18:36:04,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:04,641 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 18:36:04,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:04,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 18:36:04,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:36:04,642 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:04,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:04,692 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2022-03-20 18:36:04,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 18:36:04,692 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-20 18:36:04,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:04,692 INFO L225 Difference]: With dead ends: 26 [2022-03-20 18:36:04,692 INFO L226 Difference]: Without dead ends: 19 [2022-03-20 18:36:04,693 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2022-03-20 18:36:04,694 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 10 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:04,694 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 24 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:36:04,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-20 18:36:04,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-03-20 18:36:04,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:04,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-03-20 18:36:04,698 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2022-03-20 18:36:04,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:04,698 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-03-20 18:36:04,698 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:04,698 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-03-20 18:36:04,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 18:36:04,698 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:04,698 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:04,717 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:04,915 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:04,916 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:04,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:04,916 INFO L85 PathProgramCache]: Analyzing trace with hash 1870024951, now seen corresponding path program 3 times [2022-03-20 18:36:04,916 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:04,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [722842381] [2022-03-20 18:36:05,066 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:05,066 INFO L85 PathProgramCache]: Analyzing trace with hash -1184964815, now seen corresponding path program 1 times [2022-03-20 18:36:05,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:05,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561976929] [2022-03-20 18:36:05,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:05,067 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:05,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:05,080 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:05,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:05,090 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:05,090 INFO L85 PathProgramCache]: Analyzing trace with hash 1870024951, now seen corresponding path program 4 times [2022-03-20 18:36:05,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:05,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539066547] [2022-03-20 18:36:05,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:05,090 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:05,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:05,133 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:05,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:05,137 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:05,137 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:05,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539066547] [2022-03-20 18:36:05,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [539066547] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:05,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444552720] [2022-03-20 18:36:05,137 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:36:05,138 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:05,138 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:05,139 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:05,140 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 18:36:05,166 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:36:05,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:05,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 18:36:05,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:05,214 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:05,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:05,286 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:05,286 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1444552720] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:05,286 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:05,287 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 11 [2022-03-20 18:36:05,287 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:05,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [722842381] [2022-03-20 18:36:05,287 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [722842381] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:05,287 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:05,287 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:36:05,287 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816410526] [2022-03-20 18:36:05,287 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:05,287 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:36:05,288 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:05,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:36:05,288 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:36:05,288 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:05,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:05,330 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-03-20 18:36:05,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:36:05,330 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-20 18:36:05,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:05,331 INFO L225 Difference]: With dead ends: 28 [2022-03-20 18:36:05,331 INFO L226 Difference]: Without dead ends: 21 [2022-03-20 18:36:05,331 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=115, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:36:05,332 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 11 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:05,332 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 19 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:36:05,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-20 18:36:05,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-03-20 18:36:05,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:05,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2022-03-20 18:36:05,336 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 17 [2022-03-20 18:36:05,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:05,336 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2022-03-20 18:36:05,336 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:05,336 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2022-03-20 18:36:05,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-20 18:36:05,336 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:05,336 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:05,375 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:05,543 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6,SelfDestructingSolverStorable5 [2022-03-20 18:36:05,544 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:05,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:05,544 INFO L85 PathProgramCache]: Analyzing trace with hash -555382060, now seen corresponding path program 5 times [2022-03-20 18:36:05,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:05,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [9280297] [2022-03-20 18:36:05,690 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:05,691 INFO L85 PathProgramCache]: Analyzing trace with hash -1125859471, now seen corresponding path program 1 times [2022-03-20 18:36:05,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:05,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525443643] [2022-03-20 18:36:05,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:05,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:05,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:05,710 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:05,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:05,737 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:05,737 INFO L85 PathProgramCache]: Analyzing trace with hash -555382060, now seen corresponding path program 6 times [2022-03-20 18:36:05,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:05,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1266324094] [2022-03-20 18:36:05,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:05,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:05,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:05,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:05,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:05,813 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:05,813 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:05,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1266324094] [2022-03-20 18:36:05,814 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1266324094] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:05,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1994430736] [2022-03-20 18:36:05,814 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:36:05,814 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:05,814 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:05,815 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:05,819 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 18:36:05,864 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 18:36:05,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:05,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:36:05,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:05,940 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:36:05,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:06,038 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:36:06,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1994430736] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:06,039 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:06,039 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 7] total 15 [2022-03-20 18:36:06,039 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:06,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [9280297] [2022-03-20 18:36:06,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [9280297] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:06,039 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:06,039 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:36:06,039 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789814602] [2022-03-20 18:36:06,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:06,040 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:36:06,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:06,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:36:06,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2022-03-20 18:36:06,042 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:06,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:06,111 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2022-03-20 18:36:06,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 18:36:06,111 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-03-20 18:36:06,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:06,112 INFO L225 Difference]: With dead ends: 30 [2022-03-20 18:36:06,112 INFO L226 Difference]: Without dead ends: 23 [2022-03-20 18:36:06,112 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2022-03-20 18:36:06,113 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 12 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:06,113 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 29 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:36:06,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-20 18:36:06,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-20 18:36:06,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:06,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-03-20 18:36:06,117 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 19 [2022-03-20 18:36:06,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:06,117 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-03-20 18:36:06,117 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:06,117 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-03-20 18:36:06,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 18:36:06,118 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:06,118 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:06,125 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:06,323 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:06,323 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:06,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:06,324 INFO L85 PathProgramCache]: Analyzing trace with hash 795722097, now seen corresponding path program 7 times [2022-03-20 18:36:06,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:06,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1187241292] [2022-03-20 18:36:06,461 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:06,462 INFO L85 PathProgramCache]: Analyzing trace with hash -1066754127, now seen corresponding path program 1 times [2022-03-20 18:36:06,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:06,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138778676] [2022-03-20 18:36:06,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:06,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:06,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:06,499 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:06,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:06,528 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:06,528 INFO L85 PathProgramCache]: Analyzing trace with hash 795722097, now seen corresponding path program 8 times [2022-03-20 18:36:06,528 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:06,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512068572] [2022-03-20 18:36:06,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:06,529 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:06,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:06,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:06,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:06,616 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:06,617 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:06,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512068572] [2022-03-20 18:36:06,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1512068572] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:06,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252229566] [2022-03-20 18:36:06,617 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:36:06,617 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:06,617 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:06,618 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:06,635 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 18:36:06,658 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:36:06,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:06,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:36:06,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:06,722 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:06,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:06,901 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:06,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1252229566] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:06,901 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:06,901 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 19 [2022-03-20 18:36:06,901 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:06,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1187241292] [2022-03-20 18:36:06,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1187241292] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:06,902 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:06,902 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:36:06,902 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194192475] [2022-03-20 18:36:06,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:06,902 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:36:06,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:06,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:36:06,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2022-03-20 18:36:06,903 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:06,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:06,988 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2022-03-20 18:36:06,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:36:06,989 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-20 18:36:06,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:06,989 INFO L225 Difference]: With dead ends: 32 [2022-03-20 18:36:06,989 INFO L226 Difference]: Without dead ends: 25 [2022-03-20 18:36:06,990 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=411, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:36:06,990 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 13 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:06,990 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 34 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:36:06,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-20 18:36:06,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-20 18:36:06,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:06,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-03-20 18:36:06,995 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 21 [2022-03-20 18:36:06,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:06,995 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-03-20 18:36:06,995 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:06,995 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-03-20 18:36:06,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 18:36:06,996 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:06,996 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:07,036 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:07,207 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,SelfDestructingSolverStorable9,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:07,208 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:07,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:07,208 INFO L85 PathProgramCache]: Analyzing trace with hash 2126693582, now seen corresponding path program 9 times [2022-03-20 18:36:07,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:07,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1788675337] [2022-03-20 18:36:07,340 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:07,341 INFO L85 PathProgramCache]: Analyzing trace with hash -1007648783, now seen corresponding path program 1 times [2022-03-20 18:36:07,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:07,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844743533] [2022-03-20 18:36:07,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:07,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:07,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:07,347 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:07,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:07,352 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:07,352 INFO L85 PathProgramCache]: Analyzing trace with hash 2126693582, now seen corresponding path program 10 times [2022-03-20 18:36:07,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:07,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524515487] [2022-03-20 18:36:07,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:07,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:07,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:07,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:07,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:07,420 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:07,420 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:07,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524515487] [2022-03-20 18:36:07,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [524515487] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:07,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621074489] [2022-03-20 18:36:07,420 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:36:07,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:07,420 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:07,436 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:07,437 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 18:36:07,460 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:36:07,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:07,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 18:36:07,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:07,521 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:07,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:07,680 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:07,680 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621074489] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:07,681 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:07,681 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 17 [2022-03-20 18:36:07,681 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:07,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1788675337] [2022-03-20 18:36:07,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1788675337] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:07,681 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:07,681 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:36:07,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954819779] [2022-03-20 18:36:07,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:07,681 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 18:36:07,681 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:07,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 18:36:07,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=185, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:36:07,682 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:07,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:07,779 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2022-03-20 18:36:07,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:36:07,780 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-20 18:36:07,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:07,780 INFO L225 Difference]: With dead ends: 34 [2022-03-20 18:36:07,780 INFO L226 Difference]: Without dead ends: 27 [2022-03-20 18:36:07,781 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=163, Invalid=343, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:36:07,781 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 14 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:07,781 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 44 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:36:07,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-20 18:36:07,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-20 18:36:07,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:07,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2022-03-20 18:36:07,786 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 23 [2022-03-20 18:36:07,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:07,786 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2022-03-20 18:36:07,786 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:07,786 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2022-03-20 18:36:07,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-20 18:36:07,786 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:07,786 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:07,815 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:07,995 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11,SelfDestructingSolverStorable12 [2022-03-20 18:36:07,996 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:07,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:07,996 INFO L85 PathProgramCache]: Analyzing trace with hash 1290036459, now seen corresponding path program 11 times [2022-03-20 18:36:07,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:07,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [15012191] [2022-03-20 18:36:08,141 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:08,141 INFO L85 PathProgramCache]: Analyzing trace with hash -948543439, now seen corresponding path program 1 times [2022-03-20 18:36:08,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:08,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434891399] [2022-03-20 18:36:08,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:08,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:08,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:08,149 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:08,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:08,154 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:08,154 INFO L85 PathProgramCache]: Analyzing trace with hash 1290036459, now seen corresponding path program 12 times [2022-03-20 18:36:08,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:08,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417745979] [2022-03-20 18:36:08,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:08,154 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:08,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:08,226 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:08,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:08,230 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:08,230 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:08,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417745979] [2022-03-20 18:36:08,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417745979] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:08,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355859923] [2022-03-20 18:36:08,230 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:36:08,230 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:08,230 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:08,231 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:08,249 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 18:36:08,291 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:36:08,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:08,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 18:36:08,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:08,386 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 25 proven. 4 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-20 18:36:08,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:08,655 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 25 proven. 4 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-20 18:36:08,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355859923] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:08,656 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:08,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 9] total 20 [2022-03-20 18:36:08,656 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:08,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [15012191] [2022-03-20 18:36:08,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [15012191] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:08,656 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:08,657 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:36:08,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428902604] [2022-03-20 18:36:08,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:08,657 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:36:08,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:08,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:36:08,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=284, Unknown=0, NotChecked=0, Total=380 [2022-03-20 18:36:08,658 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:08,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:08,773 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2022-03-20 18:36:08,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 18:36:08,773 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-20 18:36:08,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:08,774 INFO L225 Difference]: With dead ends: 36 [2022-03-20 18:36:08,774 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 18:36:08,774 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=173, Invalid=529, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:36:08,775 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:08,775 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 34 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:36:08,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 18:36:08,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-20 18:36:08,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:08,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-03-20 18:36:08,780 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 25 [2022-03-20 18:36:08,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:08,780 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-03-20 18:36:08,781 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:08,781 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-03-20 18:36:08,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 18:36:08,781 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:08,781 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:08,797 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:08,985 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-20 18:36:08,985 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:08,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:08,986 INFO L85 PathProgramCache]: Analyzing trace with hash 421425608, now seen corresponding path program 13 times [2022-03-20 18:36:08,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:08,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [246064355] [2022-03-20 18:36:09,136 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:09,137 INFO L85 PathProgramCache]: Analyzing trace with hash -889438095, now seen corresponding path program 1 times [2022-03-20 18:36:09,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:09,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [609193474] [2022-03-20 18:36:09,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:09,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:09,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:09,143 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:09,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:09,148 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:09,149 INFO L85 PathProgramCache]: Analyzing trace with hash 421425608, now seen corresponding path program 14 times [2022-03-20 18:36:09,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:09,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707160989] [2022-03-20 18:36:09,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:09,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:09,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:09,234 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:09,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:09,240 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:09,240 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:09,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707160989] [2022-03-20 18:36:09,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1707160989] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:09,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1181317076] [2022-03-20 18:36:09,241 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:36:09,241 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:09,241 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:09,242 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:09,275 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 18:36:09,299 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:36:09,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:09,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-20 18:36:09,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:09,379 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:09,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:09,553 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:09,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1181317076] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:09,554 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:09,554 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 22 [2022-03-20 18:36:09,554 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:09,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [246064355] [2022-03-20 18:36:09,554 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [246064355] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:09,554 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:09,554 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:36:09,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72111752] [2022-03-20 18:36:09,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:09,555 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:36:09,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:09,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:36:09,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=323, Unknown=0, NotChecked=0, Total=462 [2022-03-20 18:36:09,555 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:09,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:09,685 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2022-03-20 18:36:09,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 18:36:09,685 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-20 18:36:09,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:09,686 INFO L225 Difference]: With dead ends: 38 [2022-03-20 18:36:09,686 INFO L226 Difference]: Without dead ends: 31 [2022-03-20 18:36:09,686 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=257, Invalid=613, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:36:09,686 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 16 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:09,687 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 34 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:36:09,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-20 18:36:09,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-20 18:36:09,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:09,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2022-03-20 18:36:09,691 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2022-03-20 18:36:09,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:09,691 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2022-03-20 18:36:09,691 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:09,691 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2022-03-20 18:36:09,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 18:36:09,692 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:09,692 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:09,713 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:09,900 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,SelfDestructingSolverStorable16,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:09,901 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:09,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:09,901 INFO L85 PathProgramCache]: Analyzing trace with hash -1089946779, now seen corresponding path program 15 times [2022-03-20 18:36:09,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:09,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [703245039] [2022-03-20 18:36:10,046 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:10,047 INFO L85 PathProgramCache]: Analyzing trace with hash -830332751, now seen corresponding path program 1 times [2022-03-20 18:36:10,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:10,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120651] [2022-03-20 18:36:10,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:10,047 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:10,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:10,052 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:10,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:10,056 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:10,056 INFO L85 PathProgramCache]: Analyzing trace with hash -1089946779, now seen corresponding path program 16 times [2022-03-20 18:36:10,057 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:10,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124409055] [2022-03-20 18:36:10,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:10,057 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:10,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:10,150 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:10,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:10,153 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:10,153 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:10,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124409055] [2022-03-20 18:36:10,153 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124409055] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:10,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094708197] [2022-03-20 18:36:10,153 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:36:10,154 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:10,154 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:10,155 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:10,162 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 18:36:10,184 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:36:10,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:10,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 18:36:10,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:10,277 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:10,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:10,496 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:10,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094708197] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:10,496 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:10,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-03-20 18:36:10,496 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:10,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [703245039] [2022-03-20 18:36:10,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [703245039] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:10,496 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:10,497 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:36:10,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855792696] [2022-03-20 18:36:10,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:10,497 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:36:10,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:10,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:36:10,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=388, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:36:10,498 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:10,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:10,669 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2022-03-20 18:36:10,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 18:36:10,669 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-03-20 18:36:10,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:10,670 INFO L225 Difference]: With dead ends: 40 [2022-03-20 18:36:10,670 INFO L226 Difference]: Without dead ends: 33 [2022-03-20 18:36:10,670 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=306, Invalid=750, Unknown=0, NotChecked=0, Total=1056 [2022-03-20 18:36:10,670 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 17 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:10,671 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 44 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:36:10,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-20 18:36:10,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-20 18:36:10,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:10,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2022-03-20 18:36:10,675 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2022-03-20 18:36:10,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:10,675 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2022-03-20 18:36:10,675 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:10,675 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2022-03-20 18:36:10,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 18:36:10,676 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:10,676 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:10,694 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:10,887 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 18:36:10,887 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:10,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:10,888 INFO L85 PathProgramCache]: Analyzing trace with hash -1819864638, now seen corresponding path program 17 times [2022-03-20 18:36:10,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:10,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [708542298] [2022-03-20 18:36:11,032 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:11,033 INFO L85 PathProgramCache]: Analyzing trace with hash -771227407, now seen corresponding path program 1 times [2022-03-20 18:36:11,033 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:11,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965111047] [2022-03-20 18:36:11,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:11,033 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:11,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:11,038 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:11,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:11,042 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:11,042 INFO L85 PathProgramCache]: Analyzing trace with hash -1819864638, now seen corresponding path program 18 times [2022-03-20 18:36:11,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:11,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1098310270] [2022-03-20 18:36:11,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:11,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:11,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:11,149 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:11,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:11,152 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:11,152 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:11,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1098310270] [2022-03-20 18:36:11,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1098310270] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:11,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [665590015] [2022-03-20 18:36:11,152 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:36:11,153 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:11,153 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:11,172 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:11,173 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 18:36:11,205 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:36:11,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:11,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:36:11,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:11,286 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-03-20 18:36:11,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:11,466 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-03-20 18:36:11,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [665590015] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:11,466 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:11,466 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 4, 8] total 21 [2022-03-20 18:36:11,466 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:11,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [708542298] [2022-03-20 18:36:11,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [708542298] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:11,467 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:11,467 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 18:36:11,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869553169] [2022-03-20 18:36:11,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:11,467 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 18:36:11,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:11,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 18:36:11,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=325, Unknown=0, NotChecked=0, Total=420 [2022-03-20 18:36:11,468 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:11,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:11,646 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2022-03-20 18:36:11,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:36:11,647 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-03-20 18:36:11,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:11,647 INFO L225 Difference]: With dead ends: 42 [2022-03-20 18:36:11,647 INFO L226 Difference]: Without dead ends: 35 [2022-03-20 18:36:11,648 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=191, Invalid=739, Unknown=0, NotChecked=0, Total=930 [2022-03-20 18:36:11,648 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 18 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:11,648 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 19 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:36:11,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-20 18:36:11,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-20 18:36:11,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:11,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-03-20 18:36:11,653 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 31 [2022-03-20 18:36:11,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:11,653 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-03-20 18:36:11,653 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:11,653 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-03-20 18:36:11,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 18:36:11,653 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:11,653 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:11,689 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:11,863 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,SelfDestructingSolverStorable20,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:11,863 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:11,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:11,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1103709407, now seen corresponding path program 19 times [2022-03-20 18:36:11,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:11,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [815690521] [2022-03-20 18:36:11,989 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:11,989 INFO L85 PathProgramCache]: Analyzing trace with hash -712122063, now seen corresponding path program 1 times [2022-03-20 18:36:11,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:11,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855046574] [2022-03-20 18:36:11,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:11,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:11,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:11,995 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:11,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:12,000 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:12,000 INFO L85 PathProgramCache]: Analyzing trace with hash 1103709407, now seen corresponding path program 20 times [2022-03-20 18:36:12,000 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:12,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265191447] [2022-03-20 18:36:12,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:12,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:12,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:12,120 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:12,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:12,123 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:12,123 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:12,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265191447] [2022-03-20 18:36:12,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1265191447] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:12,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1234081483] [2022-03-20 18:36:12,123 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:36:12,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:12,124 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:12,125 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:12,173 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 18:36:12,200 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:36:12,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:12,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-20 18:36:12,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:12,305 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:12,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:12,637 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:12,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1234081483] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:12,638 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:12,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 28 [2022-03-20 18:36:12,638 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:12,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [815690521] [2022-03-20 18:36:12,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [815690521] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:12,638 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:12,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:36:12,638 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337784953] [2022-03-20 18:36:12,638 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:12,638 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:36:12,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:12,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:36:12,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=536, Unknown=0, NotChecked=0, Total=756 [2022-03-20 18:36:12,639 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:12,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:12,858 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2022-03-20 18:36:12,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 18:36:12,859 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2022-03-20 18:36:12,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:12,860 INFO L225 Difference]: With dead ends: 44 [2022-03-20 18:36:12,860 INFO L226 Difference]: Without dead ends: 37 [2022-03-20 18:36:12,860 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=416, Invalid=1066, Unknown=0, NotChecked=0, Total=1482 [2022-03-20 18:36:12,860 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 19 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:12,861 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 19 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:36:12,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-03-20 18:36:12,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-03-20 18:36:12,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:12,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-03-20 18:36:12,865 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 33 [2022-03-20 18:36:12,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:12,865 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-03-20 18:36:12,865 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:12,865 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-03-20 18:36:12,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 18:36:12,866 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:12,866 INFO L499 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:12,907 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:13,075 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21,SelfDestructingSolverStorable22 [2022-03-20 18:36:13,076 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:13,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:13,076 INFO L85 PathProgramCache]: Analyzing trace with hash 1749755068, now seen corresponding path program 21 times [2022-03-20 18:36:13,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:13,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1248441917] [2022-03-20 18:36:13,216 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:13,216 INFO L85 PathProgramCache]: Analyzing trace with hash -653016719, now seen corresponding path program 1 times [2022-03-20 18:36:13,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:13,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017218570] [2022-03-20 18:36:13,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:13,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:13,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:13,221 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:13,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:13,225 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:13,225 INFO L85 PathProgramCache]: Analyzing trace with hash 1749755068, now seen corresponding path program 22 times [2022-03-20 18:36:13,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:13,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493582009] [2022-03-20 18:36:13,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:13,225 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:13,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:13,355 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:13,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:13,357 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:13,357 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:13,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493582009] [2022-03-20 18:36:13,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493582009] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:13,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1409217220] [2022-03-20 18:36:13,358 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:36:13,358 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:13,358 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:13,360 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:13,379 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 18:36:13,403 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:36:13,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:13,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-20 18:36:13,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:13,514 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:13,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:13,878 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:13,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1409217220] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:13,878 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:13,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2022-03-20 18:36:13,878 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:13,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1248441917] [2022-03-20 18:36:13,879 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1248441917] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:13,879 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:13,879 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 18:36:13,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840611868] [2022-03-20 18:36:13,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:13,879 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 18:36:13,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:13,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 18:36:13,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=619, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:36:13,880 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:14,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:14,113 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2022-03-20 18:36:14,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 18:36:14,113 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-03-20 18:36:14,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:14,114 INFO L225 Difference]: With dead ends: 46 [2022-03-20 18:36:14,114 INFO L226 Difference]: Without dead ends: 39 [2022-03-20 18:36:14,115 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=477, Invalid=1245, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 18:36:14,115 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 20 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 328 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 328 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:14,115 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 74 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 328 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:36:14,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-20 18:36:14,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-03-20 18:36:14,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:14,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2022-03-20 18:36:14,120 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 35 [2022-03-20 18:36:14,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:14,120 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2022-03-20 18:36:14,120 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:14,120 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2022-03-20 18:36:14,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 18:36:14,120 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:14,121 INFO L499 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:14,137 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:14,336 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23,SelfDestructingSolverStorable24 [2022-03-20 18:36:14,337 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:14,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:14,337 INFO L85 PathProgramCache]: Analyzing trace with hash -170622631, now seen corresponding path program 23 times [2022-03-20 18:36:14,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:14,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1342636989] [2022-03-20 18:36:14,477 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:14,477 INFO L85 PathProgramCache]: Analyzing trace with hash -593911375, now seen corresponding path program 1 times [2022-03-20 18:36:14,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:14,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856043702] [2022-03-20 18:36:14,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:14,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:14,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:14,482 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:14,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:14,485 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:14,486 INFO L85 PathProgramCache]: Analyzing trace with hash -170622631, now seen corresponding path program 24 times [2022-03-20 18:36:14,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:14,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836826874] [2022-03-20 18:36:14,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:14,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:14,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:14,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:14,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:14,661 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 13 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:14,661 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:14,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836826874] [2022-03-20 18:36:14,661 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836826874] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:14,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [941572637] [2022-03-20 18:36:14,661 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:36:14,661 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:14,661 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:14,671 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:14,675 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 18:36:14,708 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:36:14,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:14,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:36:14,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:14,842 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 1 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2022-03-20 18:36:14,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:15,035 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 1 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2022-03-20 18:36:15,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [941572637] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:15,036 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:15,036 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 4, 8] total 24 [2022-03-20 18:36:15,036 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:15,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1342636989] [2022-03-20 18:36:15,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1342636989] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:15,036 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:15,036 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 18:36:15,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740110120] [2022-03-20 18:36:15,036 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:15,037 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 18:36:15,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:15,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 18:36:15,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:36:15,037 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:15,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:15,325 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2022-03-20 18:36:15,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 18:36:15,325 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-03-20 18:36:15,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:15,325 INFO L225 Difference]: With dead ends: 48 [2022-03-20 18:36:15,326 INFO L226 Difference]: Without dead ends: 41 [2022-03-20 18:36:15,326 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 18:36:15,326 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 21 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:15,327 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 39 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:36:15,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-20 18:36:15,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-03-20 18:36:15,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:15,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-03-20 18:36:15,331 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 37 [2022-03-20 18:36:15,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:15,331 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-03-20 18:36:15,331 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:15,332 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-03-20 18:36:15,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 18:36:15,332 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:15,332 INFO L499 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:15,352 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-03-20 18:36:15,551 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25,SelfDestructingSolverStorable26 [2022-03-20 18:36:15,552 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:15,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:15,552 INFO L85 PathProgramCache]: Analyzing trace with hash 1182345910, now seen corresponding path program 25 times [2022-03-20 18:36:15,552 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:15,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2141521447] [2022-03-20 18:36:15,696 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:15,697 INFO L85 PathProgramCache]: Analyzing trace with hash -534806031, now seen corresponding path program 1 times [2022-03-20 18:36:15,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:15,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024233381] [2022-03-20 18:36:15,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:15,697 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:15,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:15,701 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:15,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:15,705 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:15,705 INFO L85 PathProgramCache]: Analyzing trace with hash 1182345910, now seen corresponding path program 26 times [2022-03-20 18:36:15,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:15,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592209189] [2022-03-20 18:36:15,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:15,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:15,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:15,870 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:15,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:15,873 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:15,873 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:15,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592209189] [2022-03-20 18:36:15,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [592209189] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:15,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [368401493] [2022-03-20 18:36:15,873 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:36:15,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:15,873 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:15,874 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:15,875 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 18:36:15,903 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:36:15,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:15,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-20 18:36:15,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:16,042 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:16,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:16,520 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:16,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [368401493] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:16,521 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:16,521 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 34 [2022-03-20 18:36:16,521 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:16,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2141521447] [2022-03-20 18:36:16,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2141521447] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:16,521 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:16,521 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 18:36:16,521 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86853023] [2022-03-20 18:36:16,521 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:16,521 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 18:36:16,521 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:16,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 18:36:16,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=803, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 18:36:16,522 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:16,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:16,802 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2022-03-20 18:36:16,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 18:36:16,802 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2022-03-20 18:36:16,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:16,802 INFO L225 Difference]: With dead ends: 50 [2022-03-20 18:36:16,802 INFO L226 Difference]: Without dead ends: 43 [2022-03-20 18:36:16,803 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=611, Invalid=1645, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 18:36:16,803 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 22 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:16,804 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 39 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:36:16,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-20 18:36:16,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-03-20 18:36:16,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:16,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-03-20 18:36:16,808 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 39 [2022-03-20 18:36:16,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:16,808 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-03-20 18:36:16,808 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:16,808 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-03-20 18:36:16,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 18:36:16,809 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:16,809 INFO L499 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:16,827 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:17,016 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27,SelfDestructingSolverStorable28 [2022-03-20 18:36:17,017 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:17,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:17,017 INFO L85 PathProgramCache]: Analyzing trace with hash 10023123, now seen corresponding path program 27 times [2022-03-20 18:36:17,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:17,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [272760849] [2022-03-20 18:36:17,142 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:17,142 INFO L85 PathProgramCache]: Analyzing trace with hash -475700687, now seen corresponding path program 1 times [2022-03-20 18:36:17,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:17,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487210726] [2022-03-20 18:36:17,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:17,143 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:17,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:17,148 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:17,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:17,151 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:17,151 INFO L85 PathProgramCache]: Analyzing trace with hash 10023123, now seen corresponding path program 28 times [2022-03-20 18:36:17,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:17,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213560796] [2022-03-20 18:36:17,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:17,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:17,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:17,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:17,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:17,373 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 15 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:17,373 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:17,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213560796] [2022-03-20 18:36:17,374 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213560796] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:17,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493376343] [2022-03-20 18:36:17,374 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:36:17,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:17,374 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:17,375 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:17,376 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 18:36:17,431 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:36:17,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:17,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-20 18:36:17,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:17,583 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:17,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:18,228 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:18,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493376343] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:18,229 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:18,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 36 [2022-03-20 18:36:18,229 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:18,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [272760849] [2022-03-20 18:36:18,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [272760849] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:18,229 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:18,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 18:36:18,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371231923] [2022-03-20 18:36:18,229 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:18,230 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 18:36:18,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:18,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 18:36:18,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=904, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 18:36:18,231 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:18,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:18,551 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2022-03-20 18:36:18,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 18:36:18,551 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2022-03-20 18:36:18,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:18,551 INFO L225 Difference]: With dead ends: 52 [2022-03-20 18:36:18,551 INFO L226 Difference]: Without dead ends: 45 [2022-03-20 18:36:18,552 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=684, Invalid=1866, Unknown=0, NotChecked=0, Total=2550 [2022-03-20 18:36:18,552 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 23 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 433 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 433 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:18,553 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 34 Invalid, 464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 433 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:36:18,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-20 18:36:18,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-03-20 18:36:18,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:18,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2022-03-20 18:36:18,558 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 41 [2022-03-20 18:36:18,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:18,558 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2022-03-20 18:36:18,558 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:18,558 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2022-03-20 18:36:18,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 18:36:18,558 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:18,559 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:18,575 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:18,775 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,SelfDestructingSolverStorable30,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:18,775 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:18,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:18,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1310743632, now seen corresponding path program 29 times [2022-03-20 18:36:18,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:18,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1109755757] [2022-03-20 18:36:18,892 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:18,892 INFO L85 PathProgramCache]: Analyzing trace with hash -416595343, now seen corresponding path program 1 times [2022-03-20 18:36:18,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:18,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296706867] [2022-03-20 18:36:18,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:18,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:18,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:18,898 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:18,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:18,901 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:18,901 INFO L85 PathProgramCache]: Analyzing trace with hash -1310743632, now seen corresponding path program 30 times [2022-03-20 18:36:18,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:18,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778957516] [2022-03-20 18:36:18,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:18,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:18,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:19,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:19,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:19,066 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 16 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:19,066 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:19,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778957516] [2022-03-20 18:36:19,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1778957516] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:19,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72095209] [2022-03-20 18:36:19,067 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:36:19,067 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:19,067 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:19,068 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:19,069 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 18:36:19,114 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:36:19,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:19,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:36:19,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:19,255 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 45 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-03-20 18:36:19,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:19,512 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 45 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-03-20 18:36:19,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72095209] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:19,512 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:19,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 4, 8] total 27 [2022-03-20 18:36:19,512 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:19,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1109755757] [2022-03-20 18:36:19,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1109755757] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:19,512 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:19,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 18:36:19,513 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934883096] [2022-03-20 18:36:19,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:19,513 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 18:36:19,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:19,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 18:36:19,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:36:19,514 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:19,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:19,871 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2022-03-20 18:36:19,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 18:36:19,872 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2022-03-20 18:36:19,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:19,872 INFO L225 Difference]: With dead ends: 54 [2022-03-20 18:36:19,872 INFO L226 Difference]: Without dead ends: 47 [2022-03-20 18:36:19,873 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=293, Invalid=1513, Unknown=0, NotChecked=0, Total=1806 [2022-03-20 18:36:19,873 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 24 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:19,873 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 24 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:36:19,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-20 18:36:19,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-03-20 18:36:19,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:19,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-03-20 18:36:19,878 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2022-03-20 18:36:19,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:19,878 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-03-20 18:36:19,878 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:19,878 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-03-20 18:36:19,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-20 18:36:19,879 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:19,879 INFO L499 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:19,883 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-03-20 18:36:20,082 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,SelfDestructingSolverStorable32,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:20,082 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:20,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:20,083 INFO L85 PathProgramCache]: Analyzing trace with hash 742724429, now seen corresponding path program 31 times [2022-03-20 18:36:20,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:20,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [97579198] [2022-03-20 18:36:20,194 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:20,195 INFO L85 PathProgramCache]: Analyzing trace with hash -357489999, now seen corresponding path program 1 times [2022-03-20 18:36:20,195 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:20,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123671618] [2022-03-20 18:36:20,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:20,195 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:20,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:20,199 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:20,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:20,207 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:20,207 INFO L85 PathProgramCache]: Analyzing trace with hash 742724429, now seen corresponding path program 32 times [2022-03-20 18:36:20,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:20,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424846105] [2022-03-20 18:36:20,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:20,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:20,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:20,411 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:20,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:20,432 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 17 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:20,433 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:20,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424846105] [2022-03-20 18:36:20,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1424846105] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:20,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915909854] [2022-03-20 18:36:20,433 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:36:20,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:20,433 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:20,444 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:20,445 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 18:36:20,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:36:20,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:20,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-20 18:36:20,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:20,634 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:20,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:21,469 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:21,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915909854] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:21,470 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:21,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 23] total 43 [2022-03-20 18:36:21,470 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:21,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [97579198] [2022-03-20 18:36:21,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [97579198] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:21,470 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:21,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 18:36:21,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40609079] [2022-03-20 18:36:21,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:21,471 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 18:36:21,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:21,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 18:36:21,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=443, Invalid=1363, Unknown=0, NotChecked=0, Total=1806 [2022-03-20 18:36:21,471 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 20 states, 20 states have (on average 2.05) internal successors, (41), 19 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:21,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:21,870 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2022-03-20 18:36:21,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 18:36:21,870 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 19 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2022-03-20 18:36:21,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:21,870 INFO L225 Difference]: With dead ends: 56 [2022-03-20 18:36:21,871 INFO L226 Difference]: Without dead ends: 49 [2022-03-20 18:36:21,872 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=849, Invalid=2691, Unknown=0, NotChecked=0, Total=3540 [2022-03-20 18:36:21,872 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 25 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 573 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 573 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:21,872 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 49 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 573 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:36:21,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-03-20 18:36:21,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-03-20 18:36:21,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:21,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-03-20 18:36:21,877 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 45 [2022-03-20 18:36:21,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:21,877 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-03-20 18:36:21,877 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 19 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:21,877 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-03-20 18:36:21,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-20 18:36:21,877 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:21,877 INFO L499 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:21,909 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:22,094 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33,SelfDestructingSolverStorable34 [2022-03-20 18:36:22,094 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:22,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:22,094 INFO L85 PathProgramCache]: Analyzing trace with hash -1559425110, now seen corresponding path program 33 times [2022-03-20 18:36:22,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:22,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1447168312] [2022-03-20 18:36:22,222 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:22,223 INFO L85 PathProgramCache]: Analyzing trace with hash -298384655, now seen corresponding path program 1 times [2022-03-20 18:36:22,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:22,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821689888] [2022-03-20 18:36:22,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:22,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:22,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:22,230 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:22,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:22,234 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:22,234 INFO L85 PathProgramCache]: Analyzing trace with hash -1559425110, now seen corresponding path program 34 times [2022-03-20 18:36:22,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:22,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746911591] [2022-03-20 18:36:22,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:22,234 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:22,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:22,466 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:22,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:22,469 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 18 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:22,469 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:22,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746911591] [2022-03-20 18:36:22,469 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746911591] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:22,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064488866] [2022-03-20 18:36:22,469 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:36:22,469 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:22,469 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:22,470 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:22,471 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 18:36:22,514 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:36:22,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:22,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-20 18:36:22,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:22,651 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 18 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:22,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:23,667 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 18 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:23,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2064488866] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:23,667 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:23,667 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 21] total 41 [2022-03-20 18:36:23,667 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:23,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1447168312] [2022-03-20 18:36:23,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1447168312] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:23,667 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:23,667 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 18:36:23,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368573944] [2022-03-20 18:36:23,668 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:23,668 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 18:36:23,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:23,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 18:36:23,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=459, Invalid=1181, Unknown=0, NotChecked=0, Total=1640 [2022-03-20 18:36:23,669 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:24,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:24,082 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2022-03-20 18:36:24,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 18:36:24,083 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-03-20 18:36:24,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:24,083 INFO L225 Difference]: With dead ends: 58 [2022-03-20 18:36:24,083 INFO L226 Difference]: Without dead ends: 51 [2022-03-20 18:36:24,084 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=907, Invalid=2515, Unknown=0, NotChecked=0, Total=3422 [2022-03-20 18:36:24,084 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 26 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 634 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:24,085 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 44 Invalid, 671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 634 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:36:24,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-20 18:36:24,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-03-20 18:36:24,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:24,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2022-03-20 18:36:24,089 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 47 [2022-03-20 18:36:24,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:24,089 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2022-03-20 18:36:24,090 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:24,090 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2022-03-20 18:36:24,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-20 18:36:24,090 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:24,090 INFO L499 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:24,121 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:24,299 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-03-20 18:36:24,300 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:24,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:24,300 INFO L85 PathProgramCache]: Analyzing trace with hash -2016974649, now seen corresponding path program 35 times [2022-03-20 18:36:24,300 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:24,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [906873330] [2022-03-20 18:36:24,444 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:24,444 INFO L85 PathProgramCache]: Analyzing trace with hash -239279311, now seen corresponding path program 1 times [2022-03-20 18:36:24,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:24,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355061019] [2022-03-20 18:36:24,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:24,445 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:24,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:24,458 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:24,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:24,461 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:24,461 INFO L85 PathProgramCache]: Analyzing trace with hash -2016974649, now seen corresponding path program 36 times [2022-03-20 18:36:24,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:24,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396170213] [2022-03-20 18:36:24,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:24,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:24,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:24,713 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:24,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:24,717 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 19 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:24,717 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:24,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396170213] [2022-03-20 18:36:24,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396170213] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:24,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [245331752] [2022-03-20 18:36:24,717 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:36:24,717 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:24,718 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:24,719 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:24,720 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 18:36:24,747 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:36:24,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:24,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:36:24,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:24,867 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 54 proven. 1 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2022-03-20 18:36:24,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:25,137 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 54 proven. 1 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2022-03-20 18:36:25,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [245331752] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:25,137 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:25,138 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 4, 8] total 30 [2022-03-20 18:36:25,138 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:25,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [906873330] [2022-03-20 18:36:25,138 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [906873330] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:25,138 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:25,138 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 18:36:25,138 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787944512] [2022-03-20 18:36:25,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:25,138 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 18:36:25,138 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:25,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 18:36:25,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=712, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:36:25,139 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 21 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:25,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:25,674 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2022-03-20 18:36:25,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 18:36:25,675 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 21 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2022-03-20 18:36:25,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:25,675 INFO L225 Difference]: With dead ends: 60 [2022-03-20 18:36:25,675 INFO L226 Difference]: Without dead ends: 53 [2022-03-20 18:36:25,676 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=344, Invalid=2008, Unknown=0, NotChecked=0, Total=2352 [2022-03-20 18:36:25,676 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 27 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:25,677 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 64 Invalid, 768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 729 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:36:25,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-20 18:36:25,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-03-20 18:36:25,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:25,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2022-03-20 18:36:25,708 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2022-03-20 18:36:25,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:25,708 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2022-03-20 18:36:25,708 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 21 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:25,708 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2022-03-20 18:36:25,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-03-20 18:36:25,708 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:25,708 INFO L499 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:25,724 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:25,909 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37,SelfDestructingSolverStorable38 [2022-03-20 18:36:25,909 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:25,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:25,909 INFO L85 PathProgramCache]: Analyzing trace with hash 659549860, now seen corresponding path program 37 times [2022-03-20 18:36:25,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:25,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [831411838] [2022-03-20 18:36:26,042 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:26,043 INFO L85 PathProgramCache]: Analyzing trace with hash -180173967, now seen corresponding path program 1 times [2022-03-20 18:36:26,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:26,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833018454] [2022-03-20 18:36:26,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:26,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:26,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:26,047 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:26,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:26,050 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:26,050 INFO L85 PathProgramCache]: Analyzing trace with hash 659549860, now seen corresponding path program 38 times [2022-03-20 18:36:26,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:26,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035004211] [2022-03-20 18:36:26,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:26,050 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:26,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:26,328 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:26,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:26,331 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:26,332 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:26,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035004211] [2022-03-20 18:36:26,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2035004211] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:26,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466044367] [2022-03-20 18:36:26,332 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:36:26,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:26,332 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:26,333 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:26,341 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 18:36:26,380 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:36:26,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:26,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-20 18:36:26,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:26,611 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:26,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:27,966 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:27,967 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466044367] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:27,967 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:27,967 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 23] total 45 [2022-03-20 18:36:27,967 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:27,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [831411838] [2022-03-20 18:36:27,967 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [831411838] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:27,967 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:27,967 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 18:36:27,967 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700495] [2022-03-20 18:36:27,967 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:27,968 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 18:36:27,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:27,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 18:36:27,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=1431, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 18:36:27,969 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:28,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:28,509 INFO L93 Difference]: Finished difference Result 62 states and 66 transitions. [2022-03-20 18:36:28,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 18:36:28,510 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2022-03-20 18:36:28,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:28,510 INFO L225 Difference]: With dead ends: 62 [2022-03-20 18:36:28,510 INFO L226 Difference]: Without dead ends: 55 [2022-03-20 18:36:28,511 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1087, Invalid=3073, Unknown=0, NotChecked=0, Total=4160 [2022-03-20 18:36:28,512 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 28 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 828 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 869 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 828 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:28,512 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 84 Invalid, 869 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 828 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:36:28,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-20 18:36:28,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-03-20 18:36:28,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:28,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2022-03-20 18:36:28,517 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2022-03-20 18:36:28,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:28,517 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2022-03-20 18:36:28,517 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:28,517 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2022-03-20 18:36:28,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-03-20 18:36:28,517 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:28,518 INFO L499 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:28,536 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:28,727 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-03-20 18:36:28,727 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:28,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:28,728 INFO L85 PathProgramCache]: Analyzing trace with hash 114192705, now seen corresponding path program 39 times [2022-03-20 18:36:28,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:28,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1084465560] [2022-03-20 18:36:28,846 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:28,846 INFO L85 PathProgramCache]: Analyzing trace with hash -121068623, now seen corresponding path program 1 times [2022-03-20 18:36:28,846 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:28,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749060031] [2022-03-20 18:36:28,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:28,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:28,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:28,850 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:28,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:28,855 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:28,855 INFO L85 PathProgramCache]: Analyzing trace with hash 114192705, now seen corresponding path program 40 times [2022-03-20 18:36:28,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:28,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112100484] [2022-03-20 18:36:28,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:28,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:28,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:29,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:29,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:29,177 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 21 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:29,178 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:29,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112100484] [2022-03-20 18:36:29,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [112100484] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:29,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762456869] [2022-03-20 18:36:29,178 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:36:29,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:29,178 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:29,179 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:29,180 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 18:36:29,228 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:36:29,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:29,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 45 conjunts are in the unsatisfiable core [2022-03-20 18:36:29,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:29,373 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:29,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:30,728 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:30,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762456869] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:30,728 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:30,728 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2022-03-20 18:36:30,728 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:30,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1084465560] [2022-03-20 18:36:30,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1084465560] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:30,729 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:30,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-20 18:36:30,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168903053] [2022-03-20 18:36:30,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:30,729 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-20 18:36:30,729 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:30,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-20 18:36:30,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=620, Invalid=1636, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 18:36:30,730 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:31,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:31,140 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2022-03-20 18:36:31,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-20 18:36:31,141 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2022-03-20 18:36:31,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:31,141 INFO L225 Difference]: With dead ends: 64 [2022-03-20 18:36:31,141 INFO L226 Difference]: Without dead ends: 57 [2022-03-20 18:36:31,142 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1206, Invalid=3486, Unknown=0, NotChecked=0, Total=4692 [2022-03-20 18:36:31,143 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 29 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 835 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 878 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 835 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:31,143 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 24 Invalid, 878 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 835 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:36:31,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-20 18:36:31,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-03-20 18:36:31,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 52 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:31,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2022-03-20 18:36:31,148 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 53 [2022-03-20 18:36:31,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:31,148 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2022-03-20 18:36:31,148 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:31,148 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2022-03-20 18:36:31,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-20 18:36:31,149 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:31,149 INFO L499 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:31,165 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:31,363 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41,SelfDestructingSolverStorable42 [2022-03-20 18:36:31,364 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:31,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:31,364 INFO L85 PathProgramCache]: Analyzing trace with hash 11976862, now seen corresponding path program 41 times [2022-03-20 18:36:31,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:31,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1120237856] [2022-03-20 18:36:31,436 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:31,436 INFO L85 PathProgramCache]: Analyzing trace with hash -61963279, now seen corresponding path program 1 times [2022-03-20 18:36:31,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:31,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790102353] [2022-03-20 18:36:31,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:31,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:31,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:31,446 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:31,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:31,453 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:31,453 INFO L85 PathProgramCache]: Analyzing trace with hash 11976862, now seen corresponding path program 42 times [2022-03-20 18:36:31,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:31,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1503812696] [2022-03-20 18:36:31,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:31,454 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:31,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:31,768 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:31,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:31,776 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 22 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:31,776 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:31,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1503812696] [2022-03-20 18:36:31,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1503812696] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:31,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [381996444] [2022-03-20 18:36:31,777 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:36:31,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:31,777 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:31,778 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:31,779 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 18:36:31,826 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:36:31,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:31,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:36:31,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:31,989 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 63 proven. 1 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-03-20 18:36:31,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:32,333 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 63 proven. 1 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-03-20 18:36:32,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [381996444] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:32,334 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:32,334 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 4, 8] total 33 [2022-03-20 18:36:32,334 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:32,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1120237856] [2022-03-20 18:36:32,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1120237856] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:32,334 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:32,334 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-20 18:36:32,334 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735501746] [2022-03-20 18:36:32,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:32,334 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-20 18:36:32,334 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:32,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-20 18:36:32,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=877, Unknown=0, NotChecked=0, Total=1056 [2022-03-20 18:36:32,335 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:33,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:33,045 INFO L93 Difference]: Finished difference Result 66 states and 70 transitions. [2022-03-20 18:36:33,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-20 18:36:33,045 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2022-03-20 18:36:33,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:33,046 INFO L225 Difference]: With dead ends: 66 [2022-03-20 18:36:33,046 INFO L226 Difference]: Without dead ends: 59 [2022-03-20 18:36:33,047 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=395, Invalid=2575, Unknown=0, NotChecked=0, Total=2970 [2022-03-20 18:36:33,047 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 30 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 960 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 1005 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 960 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:33,047 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 59 Invalid, 1005 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 960 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:36:33,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-03-20 18:36:33,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-03-20 18:36:33,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:33,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2022-03-20 18:36:33,052 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2022-03-20 18:36:33,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:33,052 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2022-03-20 18:36:33,052 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:33,053 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2022-03-20 18:36:33,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-20 18:36:33,053 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:33,053 INFO L499 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:33,057 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:33,257 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43,SelfDestructingSolverStorable44 [2022-03-20 18:36:33,257 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:33,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:33,257 INFO L85 PathProgramCache]: Analyzing trace with hash 566799547, now seen corresponding path program 43 times [2022-03-20 18:36:33,257 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:33,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1957768447] [2022-03-20 18:36:33,373 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:33,373 INFO L85 PathProgramCache]: Analyzing trace with hash -2857935, now seen corresponding path program 1 times [2022-03-20 18:36:33,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:33,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226296006] [2022-03-20 18:36:33,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:33,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:33,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:33,379 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:33,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:33,389 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:33,389 INFO L85 PathProgramCache]: Analyzing trace with hash 566799547, now seen corresponding path program 44 times [2022-03-20 18:36:33,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:33,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271706227] [2022-03-20 18:36:33,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:33,389 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:33,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:33,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:33,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:33,754 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 23 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:33,754 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:33,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271706227] [2022-03-20 18:36:33,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271706227] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:33,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751341123] [2022-03-20 18:36:33,754 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:36:33,755 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:33,755 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:33,756 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:33,757 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 18:36:33,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:36:33,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:33,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 49 conjunts are in the unsatisfiable core [2022-03-20 18:36:33,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:34,007 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:34,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:35,843 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:35,843 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1751341123] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:35,843 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:35,843 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 52 [2022-03-20 18:36:35,843 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:35,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1957768447] [2022-03-20 18:36:35,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1957768447] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:35,844 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:35,844 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-20 18:36:35,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118811437] [2022-03-20 18:36:35,844 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:35,844 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-20 18:36:35,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:35,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-20 18:36:35,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=724, Invalid=1928, Unknown=0, NotChecked=0, Total=2652 [2022-03-20 18:36:35,845 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:36,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:36,559 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2022-03-20 18:36:36,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-20 18:36:36,559 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2022-03-20 18:36:36,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:36,560 INFO L225 Difference]: With dead ends: 68 [2022-03-20 18:36:36,560 INFO L226 Difference]: Without dead ends: 61 [2022-03-20 18:36:36,561 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1412, Invalid=4138, Unknown=0, NotChecked=0, Total=5550 [2022-03-20 18:36:36,561 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 31 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 1113 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 1160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 1113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:36,561 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 114 Invalid, 1160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 1113 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:36:36,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-03-20 18:36:36,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-03-20 18:36:36,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:36,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2022-03-20 18:36:36,567 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2022-03-20 18:36:36,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:36,567 INFO L478 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2022-03-20 18:36:36,567 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:36,567 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2022-03-20 18:36:36,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 18:36:36,567 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:36,567 INFO L499 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:36,584 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:36,781 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,SelfDestructingSolverStorable46,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:36,782 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:36,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:36,782 INFO L85 PathProgramCache]: Analyzing trace with hash 1175455128, now seen corresponding path program 45 times [2022-03-20 18:36:36,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:36,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1395388696] [2022-03-20 18:36:36,928 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:36,929 INFO L85 PathProgramCache]: Analyzing trace with hash 56247409, now seen corresponding path program 1 times [2022-03-20 18:36:36,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:36,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2069172370] [2022-03-20 18:36:36,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:36,929 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:36,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:36,934 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:36,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:36,937 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:36,937 INFO L85 PathProgramCache]: Analyzing trace with hash 1175455128, now seen corresponding path program 46 times [2022-03-20 18:36:36,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:36,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192042031] [2022-03-20 18:36:36,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:36,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:36,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:37,312 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:37,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:37,316 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 24 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:37,316 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:37,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192042031] [2022-03-20 18:36:37,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [192042031] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:37,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659060580] [2022-03-20 18:36:37,316 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:36:37,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:37,316 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:37,317 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:37,318 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 18:36:37,373 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:36:37,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:37,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 50 conjunts are in the unsatisfiable core [2022-03-20 18:36:37,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:37,587 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 24 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:37,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:39,915 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 24 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:39,916 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659060580] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:39,916 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:39,916 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 27] total 53 [2022-03-20 18:36:39,916 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:39,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1395388696] [2022-03-20 18:36:39,916 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1395388696] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:39,916 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:39,916 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-20 18:36:39,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248587947] [2022-03-20 18:36:39,916 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:39,917 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-20 18:36:39,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:39,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-20 18:36:39,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=2003, Unknown=0, NotChecked=0, Total=2756 [2022-03-20 18:36:39,917 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:40,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:40,562 INFO L93 Difference]: Finished difference Result 70 states and 74 transitions. [2022-03-20 18:36:40,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-20 18:36:40,562 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2022-03-20 18:36:40,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:40,563 INFO L225 Difference]: With dead ends: 70 [2022-03-20 18:36:40,563 INFO L226 Difference]: Without dead ends: 63 [2022-03-20 18:36:40,564 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1495, Invalid=4357, Unknown=0, NotChecked=0, Total=5852 [2022-03-20 18:36:40,564 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 32 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 1090 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 1139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1090 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:40,564 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 19 Invalid, 1139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1090 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:36:40,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-03-20 18:36:40,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-03-20 18:36:40,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:40,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2022-03-20 18:36:40,572 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2022-03-20 18:36:40,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:40,572 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2022-03-20 18:36:40,572 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:40,572 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2022-03-20 18:36:40,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-03-20 18:36:40,573 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:40,573 INFO L499 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:40,595 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:40,789 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,SelfDestructingSolverStorable48,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:40,789 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:40,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:40,789 INFO L85 PathProgramCache]: Analyzing trace with hash 1977916213, now seen corresponding path program 47 times [2022-03-20 18:36:40,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:40,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [99705103] [2022-03-20 18:36:40,983 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:40,984 INFO L85 PathProgramCache]: Analyzing trace with hash 115352753, now seen corresponding path program 1 times [2022-03-20 18:36:40,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:40,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894377951] [2022-03-20 18:36:40,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:40,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:40,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:40,988 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:40,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:40,991 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:40,991 INFO L85 PathProgramCache]: Analyzing trace with hash 1977916213, now seen corresponding path program 48 times [2022-03-20 18:36:40,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:40,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365455962] [2022-03-20 18:36:40,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:40,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:41,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:41,396 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:41,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:41,399 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 25 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:41,399 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:41,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365455962] [2022-03-20 18:36:41,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [365455962] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:41,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459298697] [2022-03-20 18:36:41,399 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:36:41,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:41,399 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:41,400 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:41,401 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-20 18:36:41,432 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:36:41,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:41,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:36:41,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:41,651 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 72 proven. 1 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2022-03-20 18:36:41,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:42,009 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 72 proven. 1 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2022-03-20 18:36:42,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459298697] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:42,010 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:42,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 4, 8] total 36 [2022-03-20 18:36:42,010 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:42,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [99705103] [2022-03-20 18:36:42,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [99705103] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:42,010 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:42,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-03-20 18:36:42,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591220676] [2022-03-20 18:36:42,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:42,011 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-20 18:36:42,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:42,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-20 18:36:42,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1060, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 18:36:42,011 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 27 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:42,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:42,650 INFO L93 Difference]: Finished difference Result 72 states and 76 transitions. [2022-03-20 18:36:42,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-20 18:36:42,650 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 27 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2022-03-20 18:36:42,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:42,650 INFO L225 Difference]: With dead ends: 72 [2022-03-20 18:36:42,650 INFO L226 Difference]: Without dead ends: 65 [2022-03-20 18:36:42,651 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=446, Invalid=3214, Unknown=0, NotChecked=0, Total=3660 [2022-03-20 18:36:42,651 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 33 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 1311 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 1362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:42,652 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 124 Invalid, 1362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1311 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:36:42,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-03-20 18:36:42,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-03-20 18:36:42,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:42,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2022-03-20 18:36:42,658 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 61 [2022-03-20 18:36:42,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:42,658 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2022-03-20 18:36:42,658 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 27 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:42,658 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2022-03-20 18:36:42,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-03-20 18:36:42,658 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:42,658 INFO L499 BasicCegarLoop]: trace histogram [26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:42,674 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-03-20 18:36:42,874 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-03-20 18:36:42,875 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:42,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:42,875 INFO L85 PathProgramCache]: Analyzing trace with hash 48905618, now seen corresponding path program 49 times [2022-03-20 18:36:42,875 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:42,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1301163499] [2022-03-20 18:36:42,997 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:42,998 INFO L85 PathProgramCache]: Analyzing trace with hash 174458097, now seen corresponding path program 1 times [2022-03-20 18:36:42,998 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:42,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991554505] [2022-03-20 18:36:42,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:42,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:43,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:43,008 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:43,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:43,012 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:43,012 INFO L85 PathProgramCache]: Analyzing trace with hash 48905618, now seen corresponding path program 50 times [2022-03-20 18:36:43,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:43,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200978126] [2022-03-20 18:36:43,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:43,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:43,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:43,353 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:43,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:43,357 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 26 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:43,357 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:43,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200978126] [2022-03-20 18:36:43,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200978126] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:43,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1867237957] [2022-03-20 18:36:43,357 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:36:43,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:43,357 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:43,358 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:43,359 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-20 18:36:43,410 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:36:43,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:43,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 55 conjunts are in the unsatisfiable core [2022-03-20 18:36:43,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:43,650 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:43,650 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:46,450 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:46,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1867237957] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:46,451 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:46,451 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 58 [2022-03-20 18:36:46,451 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:46,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1301163499] [2022-03-20 18:36:46,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1301163499] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:46,451 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:46,451 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-20 18:36:46,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582180501] [2022-03-20 18:36:46,451 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:46,451 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-20 18:36:46,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:46,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-20 18:36:46,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=895, Invalid=2411, Unknown=0, NotChecked=0, Total=3306 [2022-03-20 18:36:46,452 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 29 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:47,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:47,118 INFO L93 Difference]: Finished difference Result 74 states and 78 transitions. [2022-03-20 18:36:47,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-20 18:36:47,118 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2022-03-20 18:36:47,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:47,119 INFO L225 Difference]: With dead ends: 74 [2022-03-20 18:36:47,119 INFO L226 Difference]: Without dead ends: 67 [2022-03-20 18:36:47,120 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1751, Invalid=5221, Unknown=0, NotChecked=0, Total=6972 [2022-03-20 18:36:47,120 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 34 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 1356 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 1409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 1356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:47,120 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 79 Invalid, 1409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 1356 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:36:47,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-03-20 18:36:47,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2022-03-20 18:36:47,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:47,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2022-03-20 18:36:47,131 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 63 [2022-03-20 18:36:47,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:47,131 INFO L478 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2022-03-20 18:36:47,132 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:47,132 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2022-03-20 18:36:47,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-03-20 18:36:47,132 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:47,132 INFO L499 BasicCegarLoop]: trace histogram [27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:47,150 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:47,348 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51,SelfDestructingSolverStorable52 [2022-03-20 18:36:47,348 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:47,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:47,348 INFO L85 PathProgramCache]: Analyzing trace with hash 1695595695, now seen corresponding path program 51 times [2022-03-20 18:36:47,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:47,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1425023165] [2022-03-20 18:36:47,423 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:47,423 INFO L85 PathProgramCache]: Analyzing trace with hash 233563441, now seen corresponding path program 1 times [2022-03-20 18:36:47,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:47,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967415718] [2022-03-20 18:36:47,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:47,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:47,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:47,427 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:47,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:47,429 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:47,430 INFO L85 PathProgramCache]: Analyzing trace with hash 1695595695, now seen corresponding path program 52 times [2022-03-20 18:36:47,430 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:47,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301989940] [2022-03-20 18:36:47,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:47,430 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:47,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:47,717 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:47,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:47,732 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 27 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:47,732 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:47,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301989940] [2022-03-20 18:36:47,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301989940] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:47,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166390002] [2022-03-20 18:36:47,732 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:36:47,733 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:47,733 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:47,735 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:47,759 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-20 18:36:47,810 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:36:47,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:47,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 57 conjunts are in the unsatisfiable core [2022-03-20 18:36:47,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:48,030 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:48,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:51,466 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:51,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [166390002] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:51,467 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:51,467 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 60 [2022-03-20 18:36:51,467 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:51,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1425023165] [2022-03-20 18:36:51,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1425023165] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:51,467 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:51,467 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-20 18:36:51,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861789772] [2022-03-20 18:36:51,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:51,468 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-20 18:36:51,468 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:51,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-20 18:36:51,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=956, Invalid=2584, Unknown=0, NotChecked=0, Total=3540 [2022-03-20 18:36:51,468 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:52,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:52,323 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2022-03-20 18:36:52,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-20 18:36:52,323 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2022-03-20 18:36:52,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:52,324 INFO L225 Difference]: With dead ends: 76 [2022-03-20 18:36:52,324 INFO L226 Difference]: Without dead ends: 69 [2022-03-20 18:36:52,325 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1872, Invalid=5610, Unknown=0, NotChecked=0, Total=7482 [2022-03-20 18:36:52,325 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 35 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 1483 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 1538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 1483 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:52,326 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 99 Invalid, 1538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 1483 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:36:52,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-20 18:36:52,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-03-20 18:36:52,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:52,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2022-03-20 18:36:52,339 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 65 [2022-03-20 18:36:52,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:52,340 INFO L478 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2022-03-20 18:36:52,340 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:52,340 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2022-03-20 18:36:52,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-03-20 18:36:52,340 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:52,340 INFO L499 BasicCegarLoop]: trace histogram [28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:52,362 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-03-20 18:36:52,555 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53,SelfDestructingSolverStorable54 [2022-03-20 18:36:52,555 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:52,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:52,556 INFO L85 PathProgramCache]: Analyzing trace with hash -678172532, now seen corresponding path program 53 times [2022-03-20 18:36:52,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:52,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [789259517] [2022-03-20 18:36:52,670 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:52,671 INFO L85 PathProgramCache]: Analyzing trace with hash 292668785, now seen corresponding path program 1 times [2022-03-20 18:36:52,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:52,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275967121] [2022-03-20 18:36:52,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:52,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:52,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:52,675 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:52,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:52,678 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:52,678 INFO L85 PathProgramCache]: Analyzing trace with hash -678172532, now seen corresponding path program 54 times [2022-03-20 18:36:52,679 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:52,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1876761474] [2022-03-20 18:36:52,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:52,679 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:52,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:53,054 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:53,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:53,057 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 28 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:53,057 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:53,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1876761474] [2022-03-20 18:36:53,057 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1876761474] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:53,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [428898843] [2022-03-20 18:36:53,057 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:36:53,057 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:53,057 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:53,071 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:53,072 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-20 18:36:53,117 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:36:53,117 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:53,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:36:53,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:53,401 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 81 proven. 1 refuted. 0 times theorem prover too weak. 702 trivial. 0 not checked. [2022-03-20 18:36:53,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:36:53,918 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 81 proven. 1 refuted. 0 times theorem prover too weak. 702 trivial. 0 not checked. [2022-03-20 18:36:53,919 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [428898843] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:36:53,919 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:36:53,919 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 4, 8] total 39 [2022-03-20 18:36:53,920 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:36:53,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [789259517] [2022-03-20 18:36:53,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [789259517] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:36:53,920 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:36:53,920 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-03-20 18:36:53,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866641552] [2022-03-20 18:36:53,920 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:36:53,920 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-03-20 18:36:53,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:53,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-03-20 18:36:53,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=1261, Unknown=0, NotChecked=0, Total=1482 [2022-03-20 18:36:53,921 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 30 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:54,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:36:54,949 INFO L93 Difference]: Finished difference Result 78 states and 82 transitions. [2022-03-20 18:36:54,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-20 18:36:54,950 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 30 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2022-03-20 18:36:54,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:36:54,951 INFO L225 Difference]: With dead ends: 78 [2022-03-20 18:36:54,951 INFO L226 Difference]: Without dead ends: 71 [2022-03-20 18:36:54,953 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 128 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=497, Invalid=3925, Unknown=0, NotChecked=0, Total=4422 [2022-03-20 18:36:54,953 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 36 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 1494 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 1551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 1494 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:36:54,953 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 19 Invalid, 1551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 1494 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:36:54,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-03-20 18:36:54,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-03-20 18:36:54,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:54,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2022-03-20 18:36:54,959 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2022-03-20 18:36:54,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:36:54,960 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2022-03-20 18:36:54,960 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 30 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:36:54,960 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2022-03-20 18:36:54,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-03-20 18:36:54,960 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:36:54,960 INFO L499 BasicCegarLoop]: trace histogram [29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:36:54,967 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-20 18:36:55,164 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2022-03-20 18:36:55,165 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:36:55,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:36:55,165 INFO L85 PathProgramCache]: Analyzing trace with hash -1241804503, now seen corresponding path program 55 times [2022-03-20 18:36:55,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:36:55,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [89526415] [2022-03-20 18:36:55,284 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:36:55,284 INFO L85 PathProgramCache]: Analyzing trace with hash 351774129, now seen corresponding path program 1 times [2022-03-20 18:36:55,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:55,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484075158] [2022-03-20 18:36:55,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:55,285 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:55,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:55,289 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:36:55,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:36:55,292 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:36:55,293 INFO L85 PathProgramCache]: Analyzing trace with hash -1241804503, now seen corresponding path program 56 times [2022-03-20 18:36:55,293 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:36:55,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429485280] [2022-03-20 18:36:55,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:36:55,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:36:55,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:55,793 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:36:55,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:36:55,796 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 29 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:55,796 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:36:55,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429485280] [2022-03-20 18:36:55,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429485280] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:36:55,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1167493681] [2022-03-20 18:36:55,797 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:36:55,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:36:55,797 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:36:55,798 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:36:55,799 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-20 18:36:55,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:36:55,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:36:55,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 61 conjunts are in the unsatisfiable core [2022-03-20 18:36:55,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:36:56,070 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:36:56,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:37:00,250 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:00,250 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1167493681] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:37:00,250 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:37:00,250 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 64 [2022-03-20 18:37:00,251 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:37:00,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [89526415] [2022-03-20 18:37:00,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [89526415] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:37:00,251 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:37:00,251 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-03-20 18:37:00,251 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413870117] [2022-03-20 18:37:00,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:37:00,251 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-20 18:37:00,251 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:00,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-20 18:37:00,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1084, Invalid=2948, Unknown=0, NotChecked=0, Total=4032 [2022-03-20 18:37:00,252 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 32 states, 32 states have (on average 2.03125) internal successors, (65), 31 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:01,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:37:01,241 INFO L93 Difference]: Finished difference Result 80 states and 84 transitions. [2022-03-20 18:37:01,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-03-20 18:37:01,242 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.03125) internal successors, (65), 31 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2022-03-20 18:37:01,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:37:01,242 INFO L225 Difference]: With dead ends: 80 [2022-03-20 18:37:01,242 INFO L226 Difference]: Without dead ends: 73 [2022-03-20 18:37:01,244 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 107 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=2126, Invalid=6430, Unknown=0, NotChecked=0, Total=8556 [2022-03-20 18:37:01,244 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 37 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 1689 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 1748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 1689 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:37:01,244 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 89 Invalid, 1748 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 1689 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:37:01,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-03-20 18:37:01,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2022-03-20 18:37:01,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:01,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2022-03-20 18:37:01,250 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 69 [2022-03-20 18:37:01,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:37:01,250 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2022-03-20 18:37:01,250 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.03125) internal successors, (65), 31 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:01,250 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2022-03-20 18:37:01,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-03-20 18:37:01,250 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:37:01,251 INFO L499 BasicCegarLoop]: trace histogram [30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:37:01,277 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-03-20 18:37:01,451 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,SelfDestructingSolverStorable58,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:01,451 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:37:01,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:37:01,451 INFO L85 PathProgramCache]: Analyzing trace with hash -1726249338, now seen corresponding path program 57 times [2022-03-20 18:37:01,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:01,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [760430631] [2022-03-20 18:37:01,576 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:37:01,576 INFO L85 PathProgramCache]: Analyzing trace with hash 410879473, now seen corresponding path program 1 times [2022-03-20 18:37:01,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:01,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088268745] [2022-03-20 18:37:01,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:01,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:01,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:01,580 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:37:01,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:01,583 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:37:01,583 INFO L85 PathProgramCache]: Analyzing trace with hash -1726249338, now seen corresponding path program 58 times [2022-03-20 18:37:01,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:01,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96736323] [2022-03-20 18:37:01,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:01,584 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:01,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:02,111 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:37:02,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:02,115 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 30 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:02,115 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:37:02,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96736323] [2022-03-20 18:37:02,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96736323] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:37:02,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2089437133] [2022-03-20 18:37:02,116 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:37:02,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:02,116 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:37:02,123 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:37:02,124 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-20 18:37:02,198 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:37:02,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:37:02,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 63 conjunts are in the unsatisfiable core [2022-03-20 18:37:02,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:37:02,435 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:02,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:37:07,475 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:07,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2089437133] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:37:07,476 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:37:07,476 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 66 [2022-03-20 18:37:07,476 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:37:07,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [760430631] [2022-03-20 18:37:07,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [760430631] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:37:07,476 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:37:07,476 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-03-20 18:37:07,476 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555904251] [2022-03-20 18:37:07,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:37:07,476 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-03-20 18:37:07,477 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:07,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-03-20 18:37:07,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1151, Invalid=3139, Unknown=0, NotChecked=0, Total=4290 [2022-03-20 18:37:07,478 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:08,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:37:08,537 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2022-03-20 18:37:08,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-20 18:37:08,537 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2022-03-20 18:37:08,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:37:08,537 INFO L225 Difference]: With dead ends: 82 [2022-03-20 18:37:08,538 INFO L226 Difference]: Without dead ends: 75 [2022-03-20 18:37:08,538 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=2259, Invalid=6861, Unknown=0, NotChecked=0, Total=9120 [2022-03-20 18:37:08,538 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 38 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 1828 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 1889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1828 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:37:08,539 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 109 Invalid, 1889 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1828 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:37:08,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-03-20 18:37:08,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-03-20 18:37:08,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:08,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2022-03-20 18:37:08,545 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 71 [2022-03-20 18:37:08,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:37:08,545 INFO L478 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2022-03-20 18:37:08,545 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:08,545 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2022-03-20 18:37:08,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-03-20 18:37:08,545 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:37:08,545 INFO L499 BasicCegarLoop]: trace histogram [31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:37:08,561 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-03-20 18:37:08,755 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-03-20 18:37:08,755 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:37:08,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:37:08,756 INFO L85 PathProgramCache]: Analyzing trace with hash 873699491, now seen corresponding path program 59 times [2022-03-20 18:37:08,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:08,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2005639227] [2022-03-20 18:37:08,864 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:37:08,864 INFO L85 PathProgramCache]: Analyzing trace with hash 469984817, now seen corresponding path program 1 times [2022-03-20 18:37:08,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:08,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205665619] [2022-03-20 18:37:08,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:08,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:08,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:08,868 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:37:08,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:08,872 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:37:08,873 INFO L85 PathProgramCache]: Analyzing trace with hash 873699491, now seen corresponding path program 60 times [2022-03-20 18:37:08,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:08,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808841419] [2022-03-20 18:37:08,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:08,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:08,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:09,395 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:37:09,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:09,398 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 31 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:09,398 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:37:09,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808841419] [2022-03-20 18:37:09,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [808841419] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:37:09,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [927354302] [2022-03-20 18:37:09,399 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:37:09,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:09,399 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:37:09,400 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:37:09,401 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-20 18:37:09,454 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:37:09,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:37:09,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:37:09,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:37:09,748 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 90 proven. 1 refuted. 0 times theorem prover too weak. 870 trivial. 0 not checked. [2022-03-20 18:37:09,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:37:10,204 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 90 proven. 1 refuted. 0 times theorem prover too weak. 870 trivial. 0 not checked. [2022-03-20 18:37:10,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [927354302] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:37:10,205 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:37:10,205 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 4, 8] total 42 [2022-03-20 18:37:10,205 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:37:10,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2005639227] [2022-03-20 18:37:10,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2005639227] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:37:10,205 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:37:10,205 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-03-20 18:37:10,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786005412] [2022-03-20 18:37:10,206 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:37:10,206 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-03-20 18:37:10,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:10,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-03-20 18:37:10,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1480, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 18:37:10,207 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:11,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:37:11,532 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2022-03-20 18:37:11,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-20 18:37:11,533 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2022-03-20 18:37:11,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:37:11,533 INFO L225 Difference]: With dead ends: 84 [2022-03-20 18:37:11,533 INFO L226 Difference]: Without dead ends: 77 [2022-03-20 18:37:11,534 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 140 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=548, Invalid=4708, Unknown=0, NotChecked=0, Total=5256 [2022-03-20 18:37:11,534 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 39 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 1971 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 2034 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1971 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:37:11,534 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 129 Invalid, 2034 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1971 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:37:11,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-03-20 18:37:11,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-03-20 18:37:11,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:11,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2022-03-20 18:37:11,540 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2022-03-20 18:37:11,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:37:11,540 INFO L478 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2022-03-20 18:37:11,540 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:11,540 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2022-03-20 18:37:11,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-03-20 18:37:11,541 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:37:11,541 INFO L499 BasicCegarLoop]: trace histogram [32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:37:11,544 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-03-20 18:37:11,744 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable61,SelfDestructingSolverStorable62 [2022-03-20 18:37:11,745 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:37:11,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:37:11,745 INFO L85 PathProgramCache]: Analyzing trace with hash -246442112, now seen corresponding path program 61 times [2022-03-20 18:37:11,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:11,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [637913600] [2022-03-20 18:37:11,884 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:37:11,884 INFO L85 PathProgramCache]: Analyzing trace with hash 529090161, now seen corresponding path program 1 times [2022-03-20 18:37:11,884 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:11,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507081570] [2022-03-20 18:37:11,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:11,885 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:11,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:11,907 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:37:11,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:11,917 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:37:11,917 INFO L85 PathProgramCache]: Analyzing trace with hash -246442112, now seen corresponding path program 62 times [2022-03-20 18:37:11,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:11,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765674704] [2022-03-20 18:37:11,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:11,917 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:11,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:12,431 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:37:12,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:12,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 32 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:12,434 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:37:12,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765674704] [2022-03-20 18:37:12,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [765674704] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:37:12,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989542185] [2022-03-20 18:37:12,435 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:37:12,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:12,435 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:37:12,436 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:37:12,437 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-20 18:37:12,500 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:37:12,500 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:37:12,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 67 conjunts are in the unsatisfiable core [2022-03-20 18:37:12,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:37:12,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:12,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:37:19,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:19,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [989542185] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:37:19,329 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:37:19,329 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 70 [2022-03-20 18:37:19,329 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:37:19,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [637913600] [2022-03-20 18:37:19,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [637913600] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:37:19,330 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:37:19,330 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-03-20 18:37:19,330 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42128673] [2022-03-20 18:37:19,330 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:37:19,330 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-20 18:37:19,330 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:19,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-20 18:37:19,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1291, Invalid=3539, Unknown=0, NotChecked=0, Total=4830 [2022-03-20 18:37:19,331 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 35 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 34 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:20,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:37:20,513 INFO L93 Difference]: Finished difference Result 86 states and 90 transitions. [2022-03-20 18:37:20,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-03-20 18:37:20,513 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 34 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2022-03-20 18:37:20,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:37:20,514 INFO L225 Difference]: With dead ends: 86 [2022-03-20 18:37:20,514 INFO L226 Difference]: Without dead ends: 79 [2022-03-20 18:37:20,515 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 568 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=2537, Invalid=7765, Unknown=0, NotChecked=0, Total=10302 [2022-03-20 18:37:20,515 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 40 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 2028 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 2093 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 2028 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:37:20,515 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 74 Invalid, 2093 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 2028 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:37:20,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-20 18:37:20,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2022-03-20 18:37:20,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:20,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2022-03-20 18:37:20,521 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 75 [2022-03-20 18:37:20,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:37:20,521 INFO L478 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2022-03-20 18:37:20,521 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 34 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:20,521 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2022-03-20 18:37:20,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-03-20 18:37:20,522 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:37:20,522 INFO L499 BasicCegarLoop]: trace histogram [33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:37:20,540 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-20 18:37:20,737 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,SelfDestructingSolverStorable64,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:20,737 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:37:20,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:37:20,737 INFO L85 PathProgramCache]: Analyzing trace with hash 1334268701, now seen corresponding path program 63 times [2022-03-20 18:37:20,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:20,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [989457041] [2022-03-20 18:37:20,858 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:37:20,858 INFO L85 PathProgramCache]: Analyzing trace with hash 588195505, now seen corresponding path program 1 times [2022-03-20 18:37:20,858 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:20,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582958508] [2022-03-20 18:37:20,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:20,858 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:20,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:20,861 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:37:20,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:20,864 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:37:20,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1334268701, now seen corresponding path program 64 times [2022-03-20 18:37:20,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:20,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140655049] [2022-03-20 18:37:20,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:20,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:20,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:21,465 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:37:21,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:21,468 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:21,468 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:37:21,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140655049] [2022-03-20 18:37:21,469 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [140655049] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:37:21,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560634892] [2022-03-20 18:37:21,469 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:37:21,469 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:21,469 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:37:21,479 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:37:21,488 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-20 18:37:21,538 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:37:21,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:37:21,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 68 conjunts are in the unsatisfiable core [2022-03-20 18:37:21,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:37:21,795 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:21,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:37:28,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:28,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560634892] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:37:28,657 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:37:28,657 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 36] total 71 [2022-03-20 18:37:28,658 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:37:28,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [989457041] [2022-03-20 18:37:28,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [989457041] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:37:28,658 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:37:28,658 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-03-20 18:37:28,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877299045] [2022-03-20 18:37:28,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:37:28,658 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-03-20 18:37:28,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:28,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-03-20 18:37:28,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1329, Invalid=3641, Unknown=0, NotChecked=0, Total=4970 [2022-03-20 18:37:28,659 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:29,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:37:29,951 INFO L93 Difference]: Finished difference Result 88 states and 92 transitions. [2022-03-20 18:37:29,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-20 18:37:29,952 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2022-03-20 18:37:29,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:37:29,952 INFO L225 Difference]: With dead ends: 88 [2022-03-20 18:37:29,952 INFO L226 Difference]: Without dead ends: 81 [2022-03-20 18:37:29,953 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=2647, Invalid=8065, Unknown=0, NotChecked=0, Total=10712 [2022-03-20 18:37:29,953 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 41 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 2275 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 2342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 2275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:37:29,954 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 174 Invalid, 2342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 2275 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 18:37:29,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-03-20 18:37:29,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2022-03-20 18:37:29,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:29,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2022-03-20 18:37:29,960 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 77 [2022-03-20 18:37:29,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:37:29,960 INFO L478 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2022-03-20 18:37:29,960 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:29,960 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2022-03-20 18:37:29,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-03-20 18:37:29,961 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:37:29,961 INFO L499 BasicCegarLoop]: trace histogram [34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:37:29,981 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-03-20 18:37:30,168 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,SelfDestructingSolverStorable66,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:30,169 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:37:30,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:37:30,169 INFO L85 PathProgramCache]: Analyzing trace with hash -21062790, now seen corresponding path program 65 times [2022-03-20 18:37:30,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:30,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [953231899] [2022-03-20 18:37:30,306 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:37:30,306 INFO L85 PathProgramCache]: Analyzing trace with hash 647300849, now seen corresponding path program 1 times [2022-03-20 18:37:30,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:30,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571826029] [2022-03-20 18:37:30,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:30,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:30,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:30,315 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:37:30,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:30,324 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:37:30,324 INFO L85 PathProgramCache]: Analyzing trace with hash -21062790, now seen corresponding path program 66 times [2022-03-20 18:37:30,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:30,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317543811] [2022-03-20 18:37:30,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:30,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:30,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:30,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:37:30,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:30,961 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 34 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:30,961 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:37:30,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317543811] [2022-03-20 18:37:30,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317543811] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:37:30,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1098742557] [2022-03-20 18:37:30,961 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:37:30,961 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:30,961 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:37:30,963 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:37:30,964 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-20 18:37:30,995 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:37:30,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:37:30,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:37:30,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:37:31,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 99 proven. 1 refuted. 0 times theorem prover too weak. 1056 trivial. 0 not checked. [2022-03-20 18:37:31,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:37:32,264 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 99 proven. 1 refuted. 0 times theorem prover too weak. 1056 trivial. 0 not checked. [2022-03-20 18:37:32,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1098742557] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:37:32,264 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:37:32,264 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 4, 8] total 45 [2022-03-20 18:37:32,265 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:37:32,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [953231899] [2022-03-20 18:37:32,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [953231899] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:37:32,265 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:37:32,265 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-03-20 18:37:32,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395326080] [2022-03-20 18:37:32,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:37:32,265 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-03-20 18:37:32,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:32,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-03-20 18:37:32,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1717, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 18:37:32,266 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 37 states, 37 states have (on average 2.027027027027027) internal successors, (75), 36 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:33,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:37:33,653 INFO L93 Difference]: Finished difference Result 90 states and 94 transitions. [2022-03-20 18:37:33,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-20 18:37:33,653 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.027027027027027) internal successors, (75), 36 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2022-03-20 18:37:33,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:37:33,654 INFO L225 Difference]: With dead ends: 90 [2022-03-20 18:37:33,654 INFO L226 Difference]: Without dead ends: 83 [2022-03-20 18:37:33,655 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 152 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=599, Invalid=5563, Unknown=0, NotChecked=0, Total=6162 [2022-03-20 18:37:33,655 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 42 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 2238 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 2307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 2238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:37:33,655 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 34 Invalid, 2307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 2238 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 18:37:33,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-03-20 18:37:33,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2022-03-20 18:37:33,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:33,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2022-03-20 18:37:33,664 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 79 [2022-03-20 18:37:33,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:37:33,664 INFO L478 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2022-03-20 18:37:33,664 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.027027027027027) internal successors, (75), 36 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:33,664 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2022-03-20 18:37:33,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-03-20 18:37:33,665 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:37:33,665 INFO L499 BasicCegarLoop]: trace histogram [35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:37:33,683 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-20 18:37:33,876 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67,SelfDestructingSolverStorable68 [2022-03-20 18:37:33,876 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:37:33,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:37:33,876 INFO L85 PathProgramCache]: Analyzing trace with hash -1119534953, now seen corresponding path program 67 times [2022-03-20 18:37:33,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:33,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [623330793] [2022-03-20 18:37:34,016 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:37:34,016 INFO L85 PathProgramCache]: Analyzing trace with hash 706406193, now seen corresponding path program 1 times [2022-03-20 18:37:34,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:34,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503303685] [2022-03-20 18:37:34,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:34,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:34,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:34,020 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:37:34,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:34,022 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:37:34,022 INFO L85 PathProgramCache]: Analyzing trace with hash -1119534953, now seen corresponding path program 68 times [2022-03-20 18:37:34,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:34,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477194399] [2022-03-20 18:37:34,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:34,023 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:34,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:34,592 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:37:34,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:34,594 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 35 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:34,594 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:37:34,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477194399] [2022-03-20 18:37:34,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477194399] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:37:34,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1461204936] [2022-03-20 18:37:34,595 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:37:34,595 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:34,595 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:37:34,596 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:37:34,597 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-20 18:37:34,688 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:37:34,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:37:34,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 76 conjunts are in the unsatisfiable core [2022-03-20 18:37:34,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:37:34,908 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:34,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:37:39,984 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:39,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1461204936] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:37:39,984 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:37:39,984 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 41] total 79 [2022-03-20 18:37:39,984 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:37:39,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [623330793] [2022-03-20 18:37:39,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [623330793] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:37:39,985 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:37:39,985 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-20 18:37:39,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760561616] [2022-03-20 18:37:39,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:37:39,985 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-20 18:37:39,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:39,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-20 18:37:39,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1523, Invalid=4639, Unknown=0, NotChecked=0, Total=6162 [2022-03-20 18:37:39,986 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 37 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:41,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:37:41,625 INFO L93 Difference]: Finished difference Result 92 states and 96 transitions. [2022-03-20 18:37:41,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-20 18:37:41,625 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 37 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2022-03-20 18:37:41,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:37:41,626 INFO L225 Difference]: With dead ends: 92 [2022-03-20 18:37:41,626 INFO L226 Difference]: Without dead ends: 85 [2022-03-20 18:37:41,627 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 714 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=2991, Invalid=9891, Unknown=0, NotChecked=0, Total=12882 [2022-03-20 18:37:41,627 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 43 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 2487 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 2558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 2487 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:37:41,627 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 129 Invalid, 2558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 2487 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-20 18:37:41,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-03-20 18:37:41,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-03-20 18:37:41,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:41,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2022-03-20 18:37:41,634 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 81 [2022-03-20 18:37:41,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:37:41,634 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2022-03-20 18:37:41,634 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 37 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:41,634 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2022-03-20 18:37:41,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-03-20 18:37:41,635 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:37:41,635 INFO L499 BasicCegarLoop]: trace histogram [36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:37:41,653 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-03-20 18:37:41,839 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2022-03-20 18:37:41,839 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:37:41,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:37:41,840 INFO L85 PathProgramCache]: Analyzing trace with hash -189328780, now seen corresponding path program 69 times [2022-03-20 18:37:41,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:41,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [94291523] [2022-03-20 18:37:41,961 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:37:41,962 INFO L85 PathProgramCache]: Analyzing trace with hash 765511537, now seen corresponding path program 1 times [2022-03-20 18:37:41,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:41,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087426609] [2022-03-20 18:37:41,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:41,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:41,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:41,965 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:37:41,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:41,968 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:37:41,968 INFO L85 PathProgramCache]: Analyzing trace with hash -189328780, now seen corresponding path program 70 times [2022-03-20 18:37:41,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:41,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [732000811] [2022-03-20 18:37:41,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:41,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:42,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:42,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:37:42,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:42,734 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 36 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:42,734 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:37:42,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [732000811] [2022-03-20 18:37:42,734 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [732000811] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:37:42,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437357092] [2022-03-20 18:37:42,734 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:37:42,734 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:42,734 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:37:42,735 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:37:42,736 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-20 18:37:42,806 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:37:42,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:37:42,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 74 conjunts are in the unsatisfiable core [2022-03-20 18:37:42,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:37:43,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 36 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:43,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:37:52,308 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 36 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:52,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437357092] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:37:52,309 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:37:52,309 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 39] total 77 [2022-03-20 18:37:52,309 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:37:52,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [94291523] [2022-03-20 18:37:52,309 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [94291523] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:37:52,309 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:37:52,309 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-03-20 18:37:52,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719225598] [2022-03-20 18:37:52,309 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:37:52,309 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-03-20 18:37:52,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:52,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-03-20 18:37:52,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1557, Invalid=4295, Unknown=0, NotChecked=0, Total=5852 [2022-03-20 18:37:52,310 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 38 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:53,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:37:53,796 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2022-03-20 18:37:53,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-03-20 18:37:53,796 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 38 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2022-03-20 18:37:53,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:37:53,797 INFO L225 Difference]: With dead ends: 94 [2022-03-20 18:37:53,797 INFO L226 Difference]: Without dead ends: 87 [2022-03-20 18:37:53,798 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=3103, Invalid=9553, Unknown=0, NotChecked=0, Total=12656 [2022-03-20 18:37:53,798 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 44 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 2602 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 2675 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 2602 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:37:53,800 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 109 Invalid, 2675 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 2602 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-20 18:37:53,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-03-20 18:37:53,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2022-03-20 18:37:53,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:53,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2022-03-20 18:37:53,807 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2022-03-20 18:37:53,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:37:53,808 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2022-03-20 18:37:53,808 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 38 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:53,808 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2022-03-20 18:37:53,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-03-20 18:37:53,808 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:37:53,808 INFO L499 BasicCegarLoop]: trace histogram [37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:37:53,826 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-03-20 18:37:54,020 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,SelfDestructingSolverStorable72,36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:54,020 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:37:54,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:37:54,020 INFO L85 PathProgramCache]: Analyzing trace with hash 385605905, now seen corresponding path program 71 times [2022-03-20 18:37:54,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:54,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1933784233] [2022-03-20 18:37:54,160 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:37:54,161 INFO L85 PathProgramCache]: Analyzing trace with hash 824616881, now seen corresponding path program 1 times [2022-03-20 18:37:54,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:54,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840918485] [2022-03-20 18:37:54,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:54,161 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:54,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:54,165 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:37:54,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:54,168 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:37:54,168 INFO L85 PathProgramCache]: Analyzing trace with hash 385605905, now seen corresponding path program 72 times [2022-03-20 18:37:54,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:54,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405987325] [2022-03-20 18:37:54,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:54,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:54,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:54,903 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:37:54,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:54,905 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 37 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:54,906 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:37:54,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405987325] [2022-03-20 18:37:54,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [405987325] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:37:54,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137369550] [2022-03-20 18:37:54,906 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:37:54,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:54,906 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:37:54,924 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:37:54,925 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-03-20 18:37:54,961 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:37:54,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:37:54,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:37:54,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:37:55,873 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 108 proven. 1 refuted. 0 times theorem prover too weak. 1260 trivial. 0 not checked. [2022-03-20 18:37:55,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:37:56,558 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 108 proven. 1 refuted. 0 times theorem prover too weak. 1260 trivial. 0 not checked. [2022-03-20 18:37:56,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1137369550] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:37:56,558 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:37:56,558 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 4, 8] total 48 [2022-03-20 18:37:56,558 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:37:56,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1933784233] [2022-03-20 18:37:56,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1933784233] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:37:56,559 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:37:56,559 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-03-20 18:37:56,559 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120824646] [2022-03-20 18:37:56,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:37:56,559 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-03-20 18:37:56,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:56,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-03-20 18:37:56,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=1972, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 18:37:56,560 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 40 states, 40 states have (on average 2.025) internal successors, (81), 39 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:58,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:37:58,539 INFO L93 Difference]: Finished difference Result 96 states and 100 transitions. [2022-03-20 18:37:58,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-03-20 18:37:58,539 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.025) internal successors, (81), 39 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2022-03-20 18:37:58,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:37:58,540 INFO L225 Difference]: With dead ends: 96 [2022-03-20 18:37:58,540 INFO L226 Difference]: Without dead ends: 89 [2022-03-20 18:37:58,541 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 164 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 677 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=650, Invalid=6490, Unknown=0, NotChecked=0, Total=7140 [2022-03-20 18:37:58,541 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 45 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 2655 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 2730 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 2655 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:37:58,541 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 34 Invalid, 2730 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 2655 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-20 18:37:58,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-03-20 18:37:58,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2022-03-20 18:37:58,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:58,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2022-03-20 18:37:58,549 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 85 [2022-03-20 18:37:58,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:37:58,549 INFO L478 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2022-03-20 18:37:58,549 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.025) internal successors, (81), 39 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:37:58,549 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2022-03-20 18:37:58,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-03-20 18:37:58,549 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:37:58,549 INFO L499 BasicCegarLoop]: trace histogram [38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:37:58,566 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-03-20 18:37:58,766 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,SelfDestructingSolverStorable74,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:58,766 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:37:58,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:37:58,766 INFO L85 PathProgramCache]: Analyzing trace with hash -1152942994, now seen corresponding path program 73 times [2022-03-20 18:37:58,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:37:58,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [566603814] [2022-03-20 18:37:58,894 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:37:58,894 INFO L85 PathProgramCache]: Analyzing trace with hash 883722225, now seen corresponding path program 1 times [2022-03-20 18:37:58,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:58,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291985158] [2022-03-20 18:37:58,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:58,895 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:58,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:58,898 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:37:58,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:37:58,902 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:37:58,902 INFO L85 PathProgramCache]: Analyzing trace with hash -1152942994, now seen corresponding path program 74 times [2022-03-20 18:37:58,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:37:58,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425146710] [2022-03-20 18:37:58,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:37:58,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:37:58,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:59,709 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:37:59,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:37:59,712 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 38 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:37:59,712 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:37:59,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425146710] [2022-03-20 18:37:59,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425146710] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:37:59,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137480186] [2022-03-20 18:37:59,712 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:37:59,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:37:59,712 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:37:59,714 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:37:59,714 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-03-20 18:37:59,760 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:37:59,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:37:59,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 78 conjunts are in the unsatisfiable core [2022-03-20 18:37:59,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:38:00,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 38 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:38:00,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:38:11,857 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 38 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:38:11,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137480186] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:38:11,858 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:38:11,858 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 41] total 81 [2022-03-20 18:38:11,858 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:38:11,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [566603814] [2022-03-20 18:38:11,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [566603814] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:38:11,858 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:38:11,858 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-03-20 18:38:11,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620541165] [2022-03-20 18:38:11,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:38:11,859 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-03-20 18:38:11,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:38:11,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-03-20 18:38:11,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1719, Invalid=4761, Unknown=0, NotChecked=0, Total=6480 [2022-03-20 18:38:11,859 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 41 states, 41 states have (on average 2.024390243902439) internal successors, (83), 40 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:38:13,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:38:13,507 INFO L93 Difference]: Finished difference Result 98 states and 102 transitions. [2022-03-20 18:38:13,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-03-20 18:38:13,507 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.024390243902439) internal successors, (83), 40 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 87 [2022-03-20 18:38:13,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:38:13,507 INFO L225 Difference]: With dead ends: 98 [2022-03-20 18:38:13,508 INFO L226 Difference]: Without dead ends: 91 [2022-03-20 18:38:13,509 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 135 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 822 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=3427, Invalid=10615, Unknown=0, NotChecked=0, Total=14042 [2022-03-20 18:38:13,510 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 46 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 2988 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 3065 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 2988 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:38:13,511 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 189 Invalid, 3065 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 2988 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-20 18:38:13,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-03-20 18:38:13,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-03-20 18:38:13,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:38:13,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2022-03-20 18:38:13,520 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 87 [2022-03-20 18:38:13,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:38:13,520 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2022-03-20 18:38:13,520 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.024390243902439) internal successors, (83), 40 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:38:13,520 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2022-03-20 18:38:13,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-03-20 18:38:13,531 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:38:13,531 INFO L499 BasicCegarLoop]: trace histogram [39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:38:13,564 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-03-20 18:38:13,760 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,SelfDestructingSolverStorable76,38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:38:13,761 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:38:13,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:38:13,761 INFO L85 PathProgramCache]: Analyzing trace with hash 2065282187, now seen corresponding path program 75 times [2022-03-20 18:38:13,761 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:38:13,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1416663102] [2022-03-20 18:38:13,885 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:38:13,885 INFO L85 PathProgramCache]: Analyzing trace with hash 942827569, now seen corresponding path program 1 times [2022-03-20 18:38:13,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:38:13,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426581326] [2022-03-20 18:38:13,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:38:13,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:38:13,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:38:13,890 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:38:13,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:38:13,899 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:38:13,899 INFO L85 PathProgramCache]: Analyzing trace with hash 2065282187, now seen corresponding path program 76 times [2022-03-20 18:38:13,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:38:13,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229731454] [2022-03-20 18:38:13,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:38:13,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:38:13,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:38:14,746 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:38:14,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:38:14,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 39 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:38:14,749 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:38:14,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229731454] [2022-03-20 18:38:14,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [229731454] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:38:14,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1949383773] [2022-03-20 18:38:14,750 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:38:14,750 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:38:14,750 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:38:14,751 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:38:14,752 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-03-20 18:38:14,832 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:38:14,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:38:14,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 80 conjunts are in the unsatisfiable core [2022-03-20 18:38:14,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:38:15,185 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 39 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:38:15,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:38:38,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 39 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:38:38,863 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1949383773] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:38:38,863 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:38:38,863 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 42] total 83 [2022-03-20 18:38:38,863 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:38:38,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1416663102] [2022-03-20 18:38:38,863 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1416663102] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:38:38,863 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:38:38,863 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-03-20 18:38:38,863 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61277955] [2022-03-20 18:38:38,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:38:38,864 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-03-20 18:38:38,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:38:38,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-03-20 18:38:38,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1803, Invalid=5003, Unknown=0, NotChecked=0, Total=6806 [2022-03-20 18:38:38,865 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 42 states, 42 states have (on average 2.0238095238095237) internal successors, (85), 41 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:38:40,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:38:40,553 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2022-03-20 18:38:40,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-03-20 18:38:40,553 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0238095238095237) internal successors, (85), 41 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2022-03-20 18:38:40,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:38:40,553 INFO L225 Difference]: With dead ends: 100 [2022-03-20 18:38:40,553 INFO L226 Difference]: Without dead ends: 93 [2022-03-20 18:38:40,554 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 863 ImplicationChecksByTransitivity, 23.7s TimeCoverageRelationStatistics Valid=3595, Invalid=11167, Unknown=0, NotChecked=0, Total=14762 [2022-03-20 18:38:40,555 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 47 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 3013 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 3092 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 3013 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:38:40,555 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 84 Invalid, 3092 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 3013 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-20 18:38:40,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-03-20 18:38:40,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-03-20 18:38:40,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:38:40,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2022-03-20 18:38:40,567 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 89 [2022-03-20 18:38:40,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:38:40,567 INFO L478 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2022-03-20 18:38:40,567 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.0238095238095237) internal successors, (85), 41 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:38:40,567 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2022-03-20 18:38:40,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-03-20 18:38:40,569 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:38:40,569 INFO L499 BasicCegarLoop]: trace histogram [40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:38:40,591 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-03-20 18:38:40,787 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77,SelfDestructingSolverStorable78 [2022-03-20 18:38:40,787 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:38:40,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:38:40,788 INFO L85 PathProgramCache]: Analyzing trace with hash -1891739288, now seen corresponding path program 77 times [2022-03-20 18:38:40,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:38:40,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1573566290] [2022-03-20 18:38:40,886 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:38:40,887 INFO L85 PathProgramCache]: Analyzing trace with hash 1001932913, now seen corresponding path program 1 times [2022-03-20 18:38:40,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:38:40,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242082765] [2022-03-20 18:38:40,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:38:40,887 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:38:40,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:38:40,908 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:38:40,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:38:40,911 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:38:40,911 INFO L85 PathProgramCache]: Analyzing trace with hash -1891739288, now seen corresponding path program 78 times [2022-03-20 18:38:40,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:38:40,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830393536] [2022-03-20 18:38:40,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:38:40,912 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:38:40,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:38:41,771 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:38:41,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:38:41,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 40 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:38:41,773 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:38:41,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830393536] [2022-03-20 18:38:41,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1830393536] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:38:41,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [546912225] [2022-03-20 18:38:41,774 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:38:41,774 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:38:41,774 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:38:41,775 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:38:41,777 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-03-20 18:38:41,833 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:38:41,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:38:41,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:38:41,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:38:43,096 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 117 proven. 1 refuted. 0 times theorem prover too weak. 1482 trivial. 0 not checked. [2022-03-20 18:38:43,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:38:44,051 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 117 proven. 1 refuted. 0 times theorem prover too weak. 1482 trivial. 0 not checked. [2022-03-20 18:38:44,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [546912225] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:38:44,051 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:38:44,051 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 4, 8] total 51 [2022-03-20 18:38:44,051 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:38:44,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1573566290] [2022-03-20 18:38:44,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1573566290] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:38:44,051 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:38:44,052 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-03-20 18:38:44,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463069744] [2022-03-20 18:38:44,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:38:44,052 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-03-20 18:38:44,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:38:44,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-03-20 18:38:44,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=2245, Unknown=0, NotChecked=0, Total=2550 [2022-03-20 18:38:44,053 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 43 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 42 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:38:46,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:38:46,378 INFO L93 Difference]: Finished difference Result 102 states and 106 transitions. [2022-03-20 18:38:46,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-03-20 18:38:46,379 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 42 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2022-03-20 18:38:46,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:38:46,379 INFO L225 Difference]: With dead ends: 102 [2022-03-20 18:38:46,379 INFO L226 Difference]: Without dead ends: 95 [2022-03-20 18:38:46,380 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 176 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 791 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=701, Invalid=7489, Unknown=0, NotChecked=0, Total=8190 [2022-03-20 18:38:46,380 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 48 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 3168 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 3249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 3168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:38:46,380 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 84 Invalid, 3249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 3168 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 18:38:46,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-03-20 18:38:46,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-03-20 18:38:46,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 90 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:38:46,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2022-03-20 18:38:46,388 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2022-03-20 18:38:46,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:38:46,388 INFO L478 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2022-03-20 18:38:46,388 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 42 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:38:46,388 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2022-03-20 18:38:46,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-03-20 18:38:46,389 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:38:46,389 INFO L499 BasicCegarLoop]: trace histogram [41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:38:46,392 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-03-20 18:38:46,592 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2022-03-20 18:38:46,593 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:38:46,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:38:46,593 INFO L85 PathProgramCache]: Analyzing trace with hash 751647493, now seen corresponding path program 79 times [2022-03-20 18:38:46,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:38:46,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [90509334] [2022-03-20 18:38:46,686 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:38:46,686 INFO L85 PathProgramCache]: Analyzing trace with hash 1061038257, now seen corresponding path program 1 times [2022-03-20 18:38:46,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:38:46,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321739308] [2022-03-20 18:38:46,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:38:46,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:38:46,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:38:46,689 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:38:46,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:38:46,692 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:38:46,692 INFO L85 PathProgramCache]: Analyzing trace with hash 751647493, now seen corresponding path program 80 times [2022-03-20 18:38:46,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:38:46,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498856251] [2022-03-20 18:38:46,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:38:46,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:38:46,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:38:47,592 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:38:47,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:38:47,594 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 41 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:38:47,594 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:38:47,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498856251] [2022-03-20 18:38:47,594 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1498856251] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:38:47,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489001323] [2022-03-20 18:38:47,595 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:38:47,595 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:38:47,595 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:38:47,596 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:38:47,597 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-03-20 18:38:47,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:38:47,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:38:47,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 85 conjunts are in the unsatisfiable core [2022-03-20 18:38:47,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:38:48,019 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:38:48,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:27,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:27,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489001323] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:27,723 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:27,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 88 [2022-03-20 18:39:27,723 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:27,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [90509334] [2022-03-20 18:39:27,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [90509334] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:27,723 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:27,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-03-20 18:39:27,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113364849] [2022-03-20 18:39:27,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:27,724 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-03-20 18:39:27,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:27,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-03-20 18:39:27,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2020, Invalid=5636, Unknown=0, NotChecked=0, Total=7656 [2022-03-20 18:39:27,725 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 44 states, 44 states have (on average 2.022727272727273) internal successors, (89), 43 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:39:29,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:29,675 INFO L93 Difference]: Finished difference Result 104 states and 108 transitions. [2022-03-20 18:39:29,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-03-20 18:39:29,675 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.022727272727273) internal successors, (89), 43 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2022-03-20 18:39:29,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:29,676 INFO L225 Difference]: With dead ends: 104 [2022-03-20 18:39:29,676 INFO L226 Difference]: Without dead ends: 97 [2022-03-20 18:39:29,678 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 143 SyntacticMatches, 2 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 910 ImplicationChecksByTransitivity, 40.2s TimeCoverageRelationStatistics Valid=3986, Invalid=12526, Unknown=0, NotChecked=0, Total=16512 [2022-03-20 18:39:29,678 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 49 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 3339 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 3422 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 3339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:29,678 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 94 Invalid, 3422 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 3339 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 18:39:29,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-03-20 18:39:29,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2022-03-20 18:39:29,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:39:29,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2022-03-20 18:39:29,686 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 93 [2022-03-20 18:39:29,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:29,688 INFO L478 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2022-03-20 18:39:29,688 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.022727272727273) internal successors, (89), 43 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:39:29,688 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2022-03-20 18:39:29,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-03-20 18:39:29,688 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:29,688 INFO L499 BasicCegarLoop]: trace histogram [42, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:29,717 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:29,905 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable81,SelfDestructingSolverStorable82 [2022-03-20 18:39:29,905 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:29,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:29,905 INFO L85 PathProgramCache]: Analyzing trace with hash -1574295198, now seen corresponding path program 81 times [2022-03-20 18:39:29,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:29,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1468477276] [2022-03-20 18:39:29,993 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:29,993 INFO L85 PathProgramCache]: Analyzing trace with hash 1120143601, now seen corresponding path program 1 times [2022-03-20 18:39:29,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:29,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589512556] [2022-03-20 18:39:29,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:29,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:30,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:30,002 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:30,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:30,012 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:30,012 INFO L85 PathProgramCache]: Analyzing trace with hash -1574295198, now seen corresponding path program 82 times [2022-03-20 18:39:30,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:30,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448764906] [2022-03-20 18:39:30,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:30,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:30,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:30,645 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:30,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:30,648 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 42 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:30,648 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:30,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448764906] [2022-03-20 18:39:30,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [448764906] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:30,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884649590] [2022-03-20 18:39:30,650 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:39:30,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:30,650 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:30,651 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:30,651 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-03-20 18:39:30,732 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:39:30,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:30,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 86 conjunts are in the unsatisfiable core [2022-03-20 18:39:30,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:30,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 42 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:30,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:40:08,369 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 42 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:08,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1884649590] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:40:08,369 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:40:08,370 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 45] total 89 [2022-03-20 18:40:08,370 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:40:08,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1468477276] [2022-03-20 18:40:08,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1468477276] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:40:08,370 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:40:08,370 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-03-20 18:40:08,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487882543] [2022-03-20 18:40:08,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:40:08,370 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-03-20 18:40:08,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:08,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-03-20 18:40:08,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2067, Invalid=5765, Unknown=0, NotChecked=0, Total=7832 [2022-03-20 18:40:08,371 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 45 states, 45 states have (on average 2.022222222222222) internal successors, (91), 44 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:40:10,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:40:10,425 INFO L93 Difference]: Finished difference Result 106 states and 110 transitions. [2022-03-20 18:40:10,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-03-20 18:40:10,426 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.022222222222222) internal successors, (91), 44 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2022-03-20 18:40:10,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:40:10,426 INFO L225 Difference]: With dead ends: 106 [2022-03-20 18:40:10,426 INFO L226 Difference]: Without dead ends: 99 [2022-03-20 18:40:10,427 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 36.8s TimeCoverageRelationStatistics Valid=4123, Invalid=12907, Unknown=0, NotChecked=0, Total=17030 [2022-03-20 18:40:10,428 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 50 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 3652 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 3737 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 3652 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:40:10,428 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 219 Invalid, 3737 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 3652 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-20 18:40:10,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-03-20 18:40:10,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-03-20 18:40:10,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:40:10,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2022-03-20 18:40:10,435 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 95 [2022-03-20 18:40:10,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:40:10,436 INFO L478 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2022-03-20 18:40:10,436 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.022222222222222) internal successors, (91), 44 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:40:10,436 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2022-03-20 18:40:10,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-03-20 18:40:10,436 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:40:10,436 INFO L499 BasicCegarLoop]: trace histogram [43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:40:10,453 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2022-03-20 18:40:10,643 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,SelfDestructingSolverStorable84,42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:10,643 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:40:10,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:40:10,644 INFO L85 PathProgramCache]: Analyzing trace with hash 872739967, now seen corresponding path program 83 times [2022-03-20 18:40:10,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:10,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1639546298] [2022-03-20 18:40:10,753 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:40:10,753 INFO L85 PathProgramCache]: Analyzing trace with hash 1179248945, now seen corresponding path program 1 times [2022-03-20 18:40:10,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:10,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105206346] [2022-03-20 18:40:10,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:10,754 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:10,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:10,766 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:40:10,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:10,782 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:40:10,783 INFO L85 PathProgramCache]: Analyzing trace with hash 872739967, now seen corresponding path program 84 times [2022-03-20 18:40:10,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:10,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535190958] [2022-03-20 18:40:10,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:10,783 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:10,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:11,730 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:40:11,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:11,733 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 43 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:11,733 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:40:11,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535190958] [2022-03-20 18:40:11,733 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535190958] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:40:11,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387100697] [2022-03-20 18:40:11,733 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:40:11,734 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:11,734 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:40:11,747 INFO L229 MonitoredProcess]: Starting monitored process 43 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:40:11,775 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-03-20 18:40:11,786 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:40:11,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:40:11,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:40:11,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:40:14,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 126 proven. 1 refuted. 0 times theorem prover too weak. 1722 trivial. 0 not checked. [2022-03-20 18:40:14,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:40:17,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 126 proven. 1 refuted. 0 times theorem prover too weak. 1722 trivial. 0 not checked. [2022-03-20 18:40:17,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1387100697] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:40:17,642 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:40:17,642 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 4, 8] total 54 [2022-03-20 18:40:17,642 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:40:17,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1639546298] [2022-03-20 18:40:17,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1639546298] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:40:17,643 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:40:17,643 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-03-20 18:40:17,643 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014335862] [2022-03-20 18:40:17,643 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:40:17,643 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-03-20 18:40:17,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:17,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-03-20 18:40:17,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=2536, Unknown=0, NotChecked=0, Total=2862 [2022-03-20 18:40:17,644 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 46 states, 46 states have (on average 2.0217391304347827) internal successors, (93), 45 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:40:20,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:40:20,145 INFO L93 Difference]: Finished difference Result 108 states and 112 transitions. [2022-03-20 18:40:20,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-20 18:40:20,145 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0217391304347827) internal successors, (93), 45 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2022-03-20 18:40:20,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:40:20,149 INFO L225 Difference]: With dead ends: 108 [2022-03-20 18:40:20,149 INFO L226 Difference]: Without dead ends: 101 [2022-03-20 18:40:20,150 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 188 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 914 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=752, Invalid=8560, Unknown=0, NotChecked=0, Total=9312 [2022-03-20 18:40:20,150 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 51 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 3711 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 3798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 3711 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:40:20,150 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 129 Invalid, 3798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 3711 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-20 18:40:20,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-03-20 18:40:20,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2022-03-20 18:40:20,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:40:20,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2022-03-20 18:40:20,166 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2022-03-20 18:40:20,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:40:20,166 INFO L478 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2022-03-20 18:40:20,166 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.0217391304347827) internal successors, (93), 45 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:40:20,166 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2022-03-20 18:40:20,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-03-20 18:40:20,166 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:40:20,166 INFO L499 BasicCegarLoop]: trace histogram [44, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:40:20,183 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-03-20 18:40:20,383 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,SelfDestructingSolverStorable86,43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:20,383 INFO L403 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:40:20,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:40:20,383 INFO L85 PathProgramCache]: Analyzing trace with hash -1168544676, now seen corresponding path program 85 times [2022-03-20 18:40:20,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:20,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [731843316] [2022-03-20 18:40:20,472 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:40:20,472 INFO L85 PathProgramCache]: Analyzing trace with hash 1238354289, now seen corresponding path program 1 times [2022-03-20 18:40:20,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:20,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125832486] [2022-03-20 18:40:20,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:20,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:20,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:20,477 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:40:20,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:20,491 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:40:20,491 INFO L85 PathProgramCache]: Analyzing trace with hash -1168544676, now seen corresponding path program 86 times [2022-03-20 18:40:20,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:20,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964017881] [2022-03-20 18:40:20,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:20,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:20,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:21,389 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:40:21,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:21,392 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:21,392 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:40:21,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964017881] [2022-03-20 18:40:21,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [964017881] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:40:21,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853831284] [2022-03-20 18:40:21,393 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:40:21,393 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:21,393 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:40:21,395 INFO L229 MonitoredProcess]: Starting monitored process 44 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:40:21,395 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-03-20 18:40:21,524 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:40:21,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:40:21,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 90 conjunts are in the unsatisfiable core [2022-03-20 18:40:21,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:40:21,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:21,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:41:38,653 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:41:38,654 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1853831284] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:41:38,654 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:41:38,654 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 47] total 93 [2022-03-20 18:41:38,654 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:41:38,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [731843316] [2022-03-20 18:41:38,654 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [731843316] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:41:38,654 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:41:38,654 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-03-20 18:41:38,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725307474] [2022-03-20 18:41:38,655 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:41:38,655 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-03-20 18:41:38,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:41:38,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-03-20 18:41:38,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2253, Invalid=6303, Unknown=0, NotChecked=0, Total=8556 [2022-03-20 18:41:38,656 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 47 states, 47 states have (on average 2.021276595744681) internal successors, (95), 46 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:41:40,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:41:40,678 INFO L93 Difference]: Finished difference Result 110 states and 114 transitions. [2022-03-20 18:41:40,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-03-20 18:41:40,678 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.021276595744681) internal successors, (95), 46 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 99 [2022-03-20 18:41:40,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:41:40,679 INFO L225 Difference]: With dead ends: 110 [2022-03-20 18:41:40,679 INFO L226 Difference]: Without dead ends: 103 [2022-03-20 18:41:40,681 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1083 ImplicationChecksByTransitivity, 75.2s TimeCoverageRelationStatistics Valid=4495, Invalid=14137, Unknown=0, NotChecked=0, Total=18632 [2022-03-20 18:41:40,681 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 52 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 3792 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 3881 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 3792 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:41:40,681 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 54 Invalid, 3881 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 3792 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 18:41:40,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-03-20 18:41:40,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2022-03-20 18:41:40,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:41:40,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2022-03-20 18:41:40,689 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 99 [2022-03-20 18:41:40,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:41:40,689 INFO L478 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2022-03-20 18:41:40,690 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.021276595744681) internal successors, (95), 46 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:41:40,690 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2022-03-20 18:41:40,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-03-20 18:41:40,690 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:41:40,690 INFO L499 BasicCegarLoop]: trace histogram [45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:41:40,707 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2022-03-20 18:41:40,900 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable87,SelfDestructingSolverStorable88 [2022-03-20 18:41:40,901 INFO L403 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:41:40,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:41:40,901 INFO L85 PathProgramCache]: Analyzing trace with hash -43032327, now seen corresponding path program 87 times [2022-03-20 18:41:40,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:41:40,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [438788534] [2022-03-20 18:41:41,021 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:41:41,021 INFO L85 PathProgramCache]: Analyzing trace with hash 1297459633, now seen corresponding path program 1 times [2022-03-20 18:41:41,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:41:41,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86047480] [2022-03-20 18:41:41,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:41:41,021 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:41:41,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:41:41,025 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:41:41,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:41:41,027 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:41:41,027 INFO L85 PathProgramCache]: Analyzing trace with hash -43032327, now seen corresponding path program 88 times [2022-03-20 18:41:41,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:41:41,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659402154] [2022-03-20 18:41:41,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:41:41,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:41:41,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:41:41,793 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:41:41,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:41:41,795 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 45 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:41:41,795 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:41:41,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659402154] [2022-03-20 18:41:41,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1659402154] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:41:41,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083381195] [2022-03-20 18:41:41,795 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:41:41,796 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:41:41,796 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:41:41,797 INFO L229 MonitoredProcess]: Starting monitored process 45 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:41:41,798 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-03-20 18:41:41,853 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:41:41,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:41:41,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 92 conjunts are in the unsatisfiable core [2022-03-20 18:41:41,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:41:42,090 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 45 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:41:42,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:43:32,646 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 45 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:43:32,647 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083381195] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:43:32,647 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:43:32,647 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 48] total 95 [2022-03-20 18:43:32,647 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:43:32,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [438788534] [2022-03-20 18:43:32,647 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [438788534] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:43:32,647 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:43:32,647 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-03-20 18:43:32,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227086514] [2022-03-20 18:43:32,647 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:43:32,648 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-03-20 18:43:32,648 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:43:32,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-03-20 18:43:32,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2349, Invalid=6581, Unknown=0, NotChecked=0, Total=8930 [2022-03-20 18:43:32,649 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 48 states, 48 states have (on average 2.0208333333333335) internal successors, (97), 47 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:43:35,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:43:35,209 INFO L93 Difference]: Finished difference Result 112 states and 116 transitions. [2022-03-20 18:43:35,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-03-20 18:43:35,210 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0208333333333335) internal successors, (97), 47 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2022-03-20 18:43:35,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:43:35,210 INFO L225 Difference]: With dead ends: 112 [2022-03-20 18:43:35,210 INFO L226 Difference]: Without dead ends: 105 [2022-03-20 18:43:35,212 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 108.2s TimeCoverageRelationStatistics Valid=4687, Invalid=14773, Unknown=0, NotChecked=0, Total=19460 [2022-03-20 18:43:35,212 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 53 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 4189 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 4280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 4189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:43:35,212 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 239 Invalid, 4280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 4189 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-03-20 18:43:35,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-03-20 18:43:35,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2022-03-20 18:43:35,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:43:35,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2022-03-20 18:43:35,220 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 101 [2022-03-20 18:43:35,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:43:35,220 INFO L478 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2022-03-20 18:43:35,221 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.0208333333333335) internal successors, (97), 47 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:43:35,221 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2022-03-20 18:43:35,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-03-20 18:43:35,221 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:43:35,221 INFO L499 BasicCegarLoop]: trace histogram [46, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:43:35,240 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-03-20 18:43:35,438 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,45 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2022-03-20 18:43:35,438 INFO L403 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:43:35,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:43:35,438 INFO L85 PathProgramCache]: Analyzing trace with hash -757423530, now seen corresponding path program 89 times [2022-03-20 18:43:35,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:43:35,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [600129832] [2022-03-20 18:43:35,592 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:43:35,592 INFO L85 PathProgramCache]: Analyzing trace with hash 1356564977, now seen corresponding path program 1 times [2022-03-20 18:43:35,592 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:43:35,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396424976] [2022-03-20 18:43:35,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:43:35,593 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:43:35,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:43:35,596 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:43:35,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:43:35,598 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:43:35,598 INFO L85 PathProgramCache]: Analyzing trace with hash -757423530, now seen corresponding path program 90 times [2022-03-20 18:43:35,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:43:35,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [586454845] [2022-03-20 18:43:35,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:43:35,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:43:35,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:43:36,511 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:43:36,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:43:36,529 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 46 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:43:36,529 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:43:36,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [586454845] [2022-03-20 18:43:36,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [586454845] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:43:36,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221995609] [2022-03-20 18:43:36,529 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:43:36,529 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:43:36,530 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:43:36,531 INFO L229 MonitoredProcess]: Starting monitored process 46 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:43:36,531 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-03-20 18:43:36,584 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:43:36,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:43:36,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:43:36,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:43:40,207 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 135 proven. 1 refuted. 0 times theorem prover too weak. 1980 trivial. 0 not checked. [2022-03-20 18:43:40,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:43:44,092 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 135 proven. 1 refuted. 0 times theorem prover too weak. 1980 trivial. 0 not checked. [2022-03-20 18:43:44,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221995609] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:43:44,093 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:43:44,093 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 4, 8] total 57 [2022-03-20 18:43:44,093 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:43:44,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [600129832] [2022-03-20 18:43:44,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [600129832] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:43:44,093 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:43:44,093 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-03-20 18:43:44,093 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75300770] [2022-03-20 18:43:44,093 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:43:44,094 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-03-20 18:43:44,094 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:43:44,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-03-20 18:43:44,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=347, Invalid=2845, Unknown=0, NotChecked=0, Total=3192 [2022-03-20 18:43:44,094 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 49 states, 49 states have (on average 2.020408163265306) internal successors, (99), 48 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:43:47,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:43:47,705 INFO L93 Difference]: Finished difference Result 114 states and 118 transitions. [2022-03-20 18:43:47,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-03-20 18:43:47,706 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.020408163265306) internal successors, (99), 48 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2022-03-20 18:43:47,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:43:47,706 INFO L225 Difference]: With dead ends: 114 [2022-03-20 18:43:47,706 INFO L226 Difference]: Without dead ends: 107 [2022-03-20 18:43:47,707 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 200 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1046 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=803, Invalid=9703, Unknown=0, NotChecked=0, Total=10506 [2022-03-20 18:43:47,707 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 54 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 4332 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 4425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 4332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:43:47,707 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 209 Invalid, 4425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 4332 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-20 18:43:47,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-03-20 18:43:47,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2022-03-20 18:43:47,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:43:47,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2022-03-20 18:43:47,716 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 103 [2022-03-20 18:43:47,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:43:47,716 INFO L478 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2022-03-20 18:43:47,716 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.020408163265306) internal successors, (99), 48 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:43:47,716 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2022-03-20 18:43:47,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-03-20 18:43:47,716 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:43:47,716 INFO L499 BasicCegarLoop]: trace histogram [47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:43:47,720 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-03-20 18:43:47,917 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,SelfDestructingSolverStorable92,46 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:43:47,917 INFO L403 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:43:47,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:43:47,918 INFO L85 PathProgramCache]: Analyzing trace with hash -92602253, now seen corresponding path program 91 times [2022-03-20 18:43:47,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:43:47,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [304660578] [2022-03-20 18:43:48,058 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:43:48,058 INFO L85 PathProgramCache]: Analyzing trace with hash 1415670321, now seen corresponding path program 1 times [2022-03-20 18:43:48,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:43:48,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140398082] [2022-03-20 18:43:48,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:43:48,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:43:48,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:43:48,061 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:43:48,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:43:48,064 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:43:48,064 INFO L85 PathProgramCache]: Analyzing trace with hash -92602253, now seen corresponding path program 92 times [2022-03-20 18:43:48,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:43:48,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626739754] [2022-03-20 18:43:48,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:43:48,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:43:48,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:43:49,028 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:43:49,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:43:49,031 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 47 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:43:49,031 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:43:49,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626739754] [2022-03-20 18:43:49,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626739754] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:43:49,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1657753086] [2022-03-20 18:43:49,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:43:49,032 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:43:49,032 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:43:49,033 INFO L229 MonitoredProcess]: Starting monitored process 47 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:43:49,037 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-03-20 18:43:49,089 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:43:49,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:43:49,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 97 conjunts are in the unsatisfiable core [2022-03-20 18:43:49,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:43:49,430 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:43:49,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:59,627 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:59,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1657753086] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:59,627 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:59,628 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2022-03-20 18:46:59,628 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:59,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [304660578] [2022-03-20 18:46:59,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [304660578] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:59,628 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:59,628 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-03-20 18:46:59,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013488564] [2022-03-20 18:46:59,628 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:59,628 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-03-20 18:46:59,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:59,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-03-20 18:46:59,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2596, Invalid=7304, Unknown=0, NotChecked=0, Total=9900 [2022-03-20 18:46:59,629 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 50 states, 50 states have (on average 2.02) internal successors, (101), 49 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:02,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:02,088 INFO L93 Difference]: Finished difference Result 116 states and 120 transitions. [2022-03-20 18:47:02,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-03-20 18:47:02,089 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.02) internal successors, (101), 49 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2022-03-20 18:47:02,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:02,090 INFO L225 Difference]: With dead ends: 116 [2022-03-20 18:47:02,090 INFO L226 Difference]: Without dead ends: 109 [2022-03-20 18:47:02,092 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1183 ImplicationChecksByTransitivity, 187.2s TimeCoverageRelationStatistics Valid=5132, Invalid=16330, Unknown=0, NotChecked=0, Total=21462 [2022-03-20 18:47:02,092 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 55 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 4293 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 4388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 4293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:02,092 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 24 Invalid, 4388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 4293 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-20 18:47:02,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-03-20 18:47:02,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2022-03-20 18:47:02,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:02,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2022-03-20 18:47:02,103 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 105 [2022-03-20 18:47:02,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:02,103 INFO L478 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2022-03-20 18:47:02,103 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.02) internal successors, (101), 49 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:02,103 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2022-03-20 18:47:02,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-03-20 18:47:02,104 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:02,104 INFO L499 BasicCegarLoop]: trace histogram [48, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:02,121 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:02,316 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,SelfDestructingSolverStorable94,47 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:02,316 INFO L403 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:02,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:02,317 INFO L85 PathProgramCache]: Analyzing trace with hash -1149482160, now seen corresponding path program 93 times [2022-03-20 18:47:02,317 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:02,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [60633308] [2022-03-20 18:47:02,410 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:47:02,411 INFO L85 PathProgramCache]: Analyzing trace with hash 1474775665, now seen corresponding path program 1 times [2022-03-20 18:47:02,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:02,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173804666] [2022-03-20 18:47:02,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:02,411 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:02,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:47:02,414 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:47:02,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:47:02,417 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:47:02,417 INFO L85 PathProgramCache]: Analyzing trace with hash -1149482160, now seen corresponding path program 94 times [2022-03-20 18:47:02,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:02,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504552555] [2022-03-20 18:47:02,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:02,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:02,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:03,393 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:03,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:03,396 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 48 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:03,396 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:03,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504552555] [2022-03-20 18:47:03,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504552555] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:03,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308545174] [2022-03-20 18:47:03,396 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:47:03,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:03,396 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:03,397 INFO L229 MonitoredProcess]: Starting monitored process 48 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:03,398 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-03-20 18:47:03,535 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:47:03,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:47:03,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 99 conjunts are in the unsatisfiable core [2022-03-20 18:47:03,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:03,775 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:03,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:50:43,774 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:50:43,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308545174] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:50:43,775 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:50:43,775 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 102 [2022-03-20 18:50:43,775 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:43,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [60633308] [2022-03-20 18:50:43,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [60633308] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:43,775 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:43,775 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-03-20 18:50:43,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228216475] [2022-03-20 18:50:43,776 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:43,776 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-03-20 18:50:43,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:43,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-03-20 18:50:43,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2699, Invalid=7603, Unknown=0, NotChecked=0, Total=10302 [2022-03-20 18:50:43,777 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)